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Medical Dictionary - Dictionary of Medicine and Human Biology


Medical Dictionary


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seryl (ser′il)
A radical of serine.

sesame (ses′a-me)
Benne plant, an herb, Sesamum indicum (family Pedaliaceae), the seeds of which are used as a food, and which are the source of s. oil. [G. s., s., an Eastern leguminous plant] s. oil the refined fixed oil obtained from the seed of one or more cultivated varieties of Sesamum indicum; a solvent for intramuscular injections. SYN: benne oil, gingili oil, teel oil.

sesamoid (ses′a-moyd)
1. Resembling in size or shape a grain of sesame. 2. Denoting a s. bone. [G. sesamoeides, like sesame]

sesqui-
Prefix denoting 32; at one time used in chemistry to indicate a ratio of 3:2 between the two parts of a compound ( e.g., sesquisulfide, sesquibasic), but presently used only for sesquihydrates and sesquiterpenes. [L.]

sesquihydrates (ses-kwi-hi′drats)
Compounds crystallizing with (nominally) 1.5 molecules of water.

sesquiterpenes (ses-kwi-ter′penz)
Compounds formed from three isoprene units; may be acyclic, mono-, di-, or tricyclic; synthesized from farnesylpyrophosphate ( E.G., trichothecin, nicin).

sessile (ses′il)
Having a broad base of attachment; not pedunculated. [L. sessilis, low-growing, fr. sedeo, pp. sessus, to sit]

sesterterpenes (ses′ter-ter-penz)
Compounds formed from five isoprene units; often have a tricyclic structure; formed from geranylfarnesylpyrophosphate ( E.G., cochliobolin B). [L. sestertius, two and one-half, fr. semis, half, + tertius, third, + terpene]

set
1. A readiness to perceive or to respond in some way; an attitude which facilitates or predetermines an outcome; e.g., prejudice or bigotry as a s. to respond negatively, independently of the merits of the stimulus. 2. To reduce a fracture; i.e., to bring the bones back into a normal position or alignment. 3. Defined group of events, objects, data, distinguishable from other groups. [M.E. sette, fr. O.Fr., fr. Med. L. secta, course, fr. sequor, to follow] haploid s. the genetic content of a normal gamete in which every autosomal locus is represented by a single allele and either one full s. of X-linked genes or one full s. of Y-linked genes; the normal adult somatic cell contains two haploid sets. learning s. a readiness or predisposition to learn developed from previous learning experiences, as when an organism learns to solve each successive problem (of equal or increasing difficulty) in fewer trials. postural s. an overall motor readiness to respond, as in a runner instructed to get s. and on the mark.

seta, pl .setae (se′ta, -te)
A bristle or a slender, stiff, bristle-like structure. SYN: chaeta. [L. saeta or s., a stiff hair or bristle]

setaceous (se-ta′shus)
1. Having bristles. 2. Resembling a bristle. [L. seta, a bristle]

Setaria (se-ta′re-a, -tar′e-a)
A nematode genus of the family Stephanofilariidae (superfamily Filarioidea). Adults are long and thin, typically occur in the peritoneal cavity, and produce sheathed microfilariae in the blood that are transmitted to other hosts after cyclical development in appropriate mosquito hosts. They are parasitic in cattle or equines (wild or domestic) and generally are nonpathogenic, although occasionally young worms may wander into the anterior chamber of the eye. [L. seta, a bristle] S. cervi a species that occurs in the abdominal cavity of cattle, buffalo, bison, yak, and various deer, but rarely in sheep. S. equina a species that is a common parasite of horses and other equids in all parts of the world; they are slender whitish filaments, several inches in length, usually found free in the peritoneal cavity, but occasionally reported in the pleural cavity, lungs, scrotum, eye, and intestine.

setback (set′bak)
A surgical operation for treatment of a bilateral cleft of the palate in which the premaxilla is moved posteriorly; the procedure is often accompanied by bone grafting.

setiferous (se-tif′er-us)
Bristly or having bristles. SYN: setigerous. [L. seta, bristle, + fero, to carry]

setigerous (se-tij′er-us)
SYN: setiferous. [L. seta, bristle, + gero, to bear]

seton (se′ton)
A wisp of threads, a strip of gauze, a length of wire, or other foreign material passed through the subcutaneous tissues or a cyst to form a sinus or fistula. [L. seta, bristle]

setting
Hardening, as of amalgam.

set-up
1. The arrangement of teeth on a trial denture base. 2. A procedure in dental case analysis involving cutting off and repositioning of teeth in the desired positions on a plaster cast.

severe combined immunodeficient mice (SCID mice)
Mice that lack both T and B lymphocytes and are used for transplantation and study of human lymphoid tissues resulting in a SCID-human mouse chimera. SEE ALSO: severe combined immunodeficiency.

Severinghaus
John W., U.S. physiologist and anesthesiologist, *1922. See S. electrode.

sevoflurane (sev-o-floor′an)
A halogenated ether for inhalation anesthesia.

sevum (se′vum)
Suet or tallow. [L.]

sex (seks)
1. The biologic character or quality that distinguishes male and female from one another as expressed by analysis of the individual's gonadal, morphologic (internal and external), chromosomal, and hormonal characteristics. Cf.:gender. 2. The physiologic and psychological processes within an individual which prompt behavior related to procreation or erotic pleasure. [L. sexus] s. assignment process whereby the s. of an intersex (hermaphroditic) newborn is initially assigned. safe s. sexual practices that limit the risk of transmitting or acquiring an infectious disease via exchanges of semen, blood, and other bodily fluids, e.g., use of a condom, mutual masturbation, and avoidance of anal intercourse.

sexdigitate (seks-dij′i-tat)
Having six digits on one or both hands or feet. SYN: sedigitate. [L. sex, six, + digitus, finger or toe]

sex-influenced
Denoting a class of genetic disorders in which the same genotype has differing manifestations in the two sexes; the variation may be rational ( e.g., breast cancer occurs less frequently in males) or have only empirical support ( e.g., pattern baldness behaves as a dominant trait in the male and as a recessive trait in the female). SEE ALSO: sex-influenced inheritance.

sexivalent (sek-si-va′lent, sek-siv′a-lent)
Having a valence of six. [L. sex, six, + valencia, strength]

sex-limited
Occurring in one sex only. See sex-limited inheritance.

sex-linked
See sex linkage.

sexology (sek-sol′o-je)
The scientific study of all aspects of sex, including differentiation and dimorphism, and, particularly, sexual behavior. [L. sexus, sex, + G. logos, study]

sextan (seks′tan)
Denoting a malarial fever the paroxysms of which recur every sixth day, counting the day of the episode as the first; i.e., with a four-day asymptomatic interval. [L. sextus, sixth]

sexual (sek′shoo-al)
Relating to sex, including stimulation, responsiveness, and functioning of the sex organs. [L. sexualis, fr. sexus, sex]

sexuality (sek-shoo-al′i-te)
1. The sum of a person's sexual behaviors and tendencies, and the strength of such tendencies. 2. One's degree of sexual attractiveness. 3. The quality of having sexual functions or implications. infantile s. in psychoanalytic personality theory, the concept concerning psychosexual development in infants and children; encompasses the overlapping oral, anal, and phallic phases during the first five years of life.

sexualization (sek′shoo-al-i-za′shun)
1. The state characterized by the presence of sexual energy or drive. 2. The act of acquiring sexual energy or drive. 3. The act of imputing a sexual meaning or quality to persons or behaviors.

sexual preference
The gender sought in one's sexual partners. 2. A particular mode of behavior leading to sexual satisfaction.

Sézary
Albert, French dermatologist, 1880–1956. See S. cell, S. erythroderma, S. syndrome.

SFO
Abbreviation for subfornical organ.

S.G.O.
Abbreviation for Surgeon General's Office.

SGOT
Abbreviation for serum glutamic-oxaloacetic transaminase.

SGPT
Abbreviation for serum glutamic-pyruvic transaminase.

SH
1. Abbreviation for serum hepatitis. 2. Abbreviation for sulfhydryl.

shadow (shad′o)
1. A surface area defined by the interception of light or x-rays by a body. SEE ALSO: density (3) . 2. In jungian psychology, the archetype consisting of collective animal instincts. 3. SYN: achromocyte. acoustic s. sonographic appearance of reduced echo amplitude from regions lying beyond an attenuating object. Cf.:acoustic enhancement. Gumprecht shadows SYN: smudge cells, under cell. hilar s. radiographic hilum of the lung; a composite radiographic s. of the central pulmonary arteries and veins, with associated bronchial walls and lymph nodes, within the right or left lung. Ponfick s. SYN: achromocyte. radiographic parallel line s. SYN: tram lines, under line.

shadow-casting
Vacuum evaporation and deposition of a film of carbon or metals such as palladium, platinum, or chromium on a contoured microscopic object in order to allow the object to be seen in relief with the electron microscope or sometimes with the light microscope.

Shaffer
A., U.S. biochemist, 1881–1960. See S.-Hartmann method.

shaft [TA]
SYN: diaphysis. [A.S. sceaft] s. of clavicle [TA] the elongated, rodlike body of the clavicle. SYN: corpus claviculae [TA] , body of clavicle&star. s. of femur [TA] the cylindrical s. of the thigh bone. SYN: corpus ossis femoris [TA] , body of femur&star, body of thigh bone, corpus femoris. s. of fibula [TA] the body of fibula; of the fibula elongated, rod-like portion which accounts for most of its length. SYN: corpus fibulae [TA] , body of fibula&star. hair s. the non-growing portion of a hair which protrudes from the skin, i.e., from the follicle. SYN: scapus pili. s. of humerus [TA] the elongated rodlike portion of the humerus between the surgical neck proximally and the emergence of the supracondylar ridges distally. SYN: corpus humeri [TA] , body of humerus&star. s. of metacarpal [TA] the elongated, rodlike portion of the metacarpal bone. SYN: corpus metacarpale [TA] , body of metacarpal&star. s. of metatarsal [TA] the elongated, rodlike portion of the metatarsal bone. SYN: corpus metatarsale [TA] , body of metatarsal&star. s. of phalanx [TA] the s. of each phalanx of the hand or foot. SYN: corpus phalangis [TA] , body of phalanx&star. s. of radius [TA] the triangular body of the radius located between the expanded proximal and distal extremities of the bone. SYN: corpus radii [TA] , body of radius&star. s. of tibia [TA] the triangular body of tibia between its expanded proximal and distal ends. SYN: corpus tibiae [TA] , body of tibia&star. s. of ulna [TA] the s. of the ulna between the proximal extremity and the head. SYN: corpus ulnae [TA] , body of ulna&star.

shakes
The vernacular term for a paroxysm associated with an intermittent fever. smelter's s. SYN: smelter's fever.

shank
1. The tibia; the shin; the leg. 2. The portion of an instrument that connects the cutting or functional portion to a handle; with rotary tools, such as burrs and drills, the end that fits into the chuck. [A.S. sceanca]

shaping (shap′ing)
In operant conditioning, when the operant response is not in the organism's repertoire, a procedure in which the experimenter breaks down the response into those parts which appear most frequently, begins reinforcing them, and then slowly and successively withholds the reinforcer until more and more of the operant is emitted.

shark liver oil
Oil extracted from the livers of sharks, mainly of the species Hypoprion brevirostris; a rich source of vitamins A and D.

Sharpey
William, Scottish physiologist and histologist, 1802–1880. See S. fibers, under fiber.

Sharpey-Schäfer
See Schäfer.

Shaver
Cecil Gordon, Canadian physician, *1901. See S. disease.

SHBG
Abbreviation for sex hormone-binding globulin.

shear (sher)
The distortion of a body by two oppositely directed parallel forces. The distortion consists of a sliding over one another of imaginary planes (within the body) parallel to the planes of the forces. [A.S.]

shears (sherz)
SYN: scissors. Liston s. strong s. for cutting plaster of Paris bandages.

sheath (sheth)
1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. SYN: vagina (1) . 2. The prepuce of male animals, especially of the horse. 3. A specially designed tubular instrument through which special obturators or cutting instruments can be passed, or through which blood clots, tissue fragments, calculi, etc. can be evacuated. 4. A tube used as an orthodontic appliance, usually on molars. [A.S. scaeth] anterior tarsal tendinous sheaths [TA] synovial tendon sheaths that allow movement of tendons across the anterior aspect of the tarsal bones, deep to the extensor retinacula; included are the tendinous sheaths (vagina tendini musculi...) of: (1) the tibialis anterior (muscle) [TA] (...tibialis anterioris [TA]), (2) the extensor hallucis longus (muscle) [TA] (...extensoris hallucis longi [TA]), and (3) the extensor digitorum longus (muscle) [TA] (...extensoris digitorum longi [TA]). SYN: vaginae tendinum tarsales anteriores [TA] . axillary s. fibrous neurovascular s., formed as an extension of the prevertebral layer of deep cervical fascia through the cervicoaxillary canal, which enclosed the first part of the axillary artery, the axillary vein, and the brachial plexus. carotid s. [TA] the dense fibrous investment of the carotid artery, internal jugular vein, and vagus nerve on each side of the neck, deep to the sternocleidomastoid muscle; the layers of cervical fascia blend with it. SYN: vagina carotica [TA] . carpal tendinous sheaths [TA] tendon sheaths occurring in relation to the wrist, allowing tendons to slide freely across the bones and bony formations of the wrist as they are held in place by the flexor and extensor retinacula. SYN: vaginae tendinum carpalium [TA] . caudal s. a group of microtubules arranged cylindrically around the caudal pole of the nucleus in a developing spermatozoon. common flexor s. (of hand) [TA] the synovial palmar carpal tendinous s. that surrounds the eight tendons of the superficial and deep flexors of the digits of the hand as they pass through the carpal canal; it is commonly continuous with the synovial digital s. of the little finger. SYN: vagina communis tendinum musculorum flexorum (manus) [TA] , ulnar bursa. common peroneal tendon s. the s. that surrounds the tendons of the fibularis (peroneus) longus and brevis muscles in their passage across the ankle. SYN: vagina communis tendinum musculorum fibularium communis [TA] , vagina tendinum musculorum fibularium communis, vagina tendinum musculorum peroneorum communis. crural s. SYN: femoral s.. dentinal s. a layer of tissue relatively resistant to the action of acids, which forms the walls of the dentinal tubules. SYN: Neumann s.. dorsal carpal tendinous sheaths [TA] synovial tendon sheaths enabling tendon movement across the posterior aspect of the wrist deep to the extensor retinaculum; they are the following six tendinous sheaths (vaginae tendinum... [TA]): (1) of abductor longus and extensor pollicis brevis (muscles) [TA] (...musculorum abductoris longi et extensoris pollicis brevis [TA]); (2) of extensors carpi radiales (muscles) [TA] (...musculi extensorum carpi radialium [TA]); (3) of extensor pollicis longus (muscle) [TA] (...musculi extensoris pollicis longi [TA]); (4) of extensor digitorum and extensor indicis (muscles) [TA] (...musculorum extensoris digitorum et extensoris indicis [TA]); (5) of extensor digiti minimi (muscle) (...musculi extensoris digiti minimi [TA]); and (6) of extensor carpi ulnaris (muscle) [TA] (...musculi extensoris carpi ulnaris [TA]). SYN: vaginae tendinum carpalium dorsalium [TA] . dural s. an extension of the dura mater that ensheathes the roots of spinal nerves or, more particularly, the vagina externa nervi optici. dural s. of optic nerve SYN: outer s. of optic nerve. enamel rod s. organic covering of the individual enamel rod. external s. of optic nerve SYN: outer s. of optic nerve. external root s. root s.. s. of eyeball SYN: fascial s. of eyeball. fascial sheaths of extraocular muscles SYN: muscular fascia of extraocular muscle. fascial s. of eyeball [TA] a condensation of connective tissue on the outer aspect of the sclera from which it is separated by a narrow cleftlike episcleral space; the s. is attached to the sclera near the sclerocorneal junction and blends with the fascia of the extraocular muscles. SYN: vagina bulbi [TA] , capsula bulbi, eye capsule, fascia bulbi, s. of eyeball, Tenon capsule, vagina oculi. femoral s. the fascia enclosing the femoral vessels, formed by the transversalis fascia anteriorly and the iliac fascia posteriorly; two septa divide the s. into three compartments, the lateral of which contains the femoral artery and the femoral branch of the genitofemoral nerve, the middle contains the femoral vein, and the medial is the femoral canal. SYN: crural s., infundibuliform s.. fenestrated s. a s. with a window cut in the tip or lateral convexity, through which special cutting instruments can be passed. fibrous sheaths fibrous tendon s., fibrous sheaths of digits of hand, fibrous digital sheaths of toes. fibrous digital sheaths of foot SYN: fibrous digital sheaths of toes. fibrous digital sheaths of hand SYN: fibrous sheaths of digits of hand. fibrous digital sheaths of toes [TA] fibrous sheaths of the toes, the tubular fibrous layer enclosing the synovial s. and the tendons of the long and short flexors of the toes and the flexor hallucis longus in the digits; they are composed of annular and cruciform parts. SYN: vaginae fibrosae digitorum pedis [TA] , fibrous digital sheaths of foot. fibrous sheaths of digits of hand [TA] fibrous sheaths of the digits of the hand, the tubular fibrous layers that enclose the synovial sheaths and the superficial and deep flexor tendons and the tendon of the flexor pollicis longus in their passage along their respective digits; they are composed of annular and cruciform parts. SYN: vaginae fibrosae digitorum manus [TA] , fibrous digital sheaths of hand. fibrous tendon s. [TA] fibrous s. of a tendon. SYN: stratum fibrosum vaginae tendinis&star, vagina fibrosa tendinis. fibular tarsal tendinous sheaths [TA] synovial tendon sheaths of flexor tendons enabling movement of tendons posterior to the lateral malleolus and across tarsal bones, passing deep to the fibular retinacula; includes (1) the common tendinous s. of fibulares (peronei) muscles [TA] (vagina communis tendineum musculorum fibularum (peroneum) [TA]); and (2) the plantar tendinous s. of fibularis (peroneus) (muscle) [TA]) (vagina plantaris tendinis musculi fibularis (peronei) longi [TA]). SYN: vaginae tendinum tarsales fibulares [TA] . Henle s. SYN: endoneurium. Hertwig s. the merged outer and inner epithelial layers of the enamel organ which extends beyond the region of the anatomical crown and initiates formation of dentin in the root of a developing tooth; it atrophies as the root is formed, and any of the cells that persist are called Malassez epithelial rests. Huxley s. SYN: Huxley layer. infundibuliform s. SYN: femoral s.. inner s. of optic nerve [TA] the innermost s. around the optic nerve, continuous with the leptomeninges (pia-arachnoid) and including a cerebrospinal fluid-filled intervaginal space, continuous with the subarachnoid space. SYN: vagina interna nervi optici [TA] , internal s. of optic nerve. internal s. of optic nerve SYN: inner s. of optic nerve. internal root s. root s.. intertubercular tendon s. [TA] the extension of the synovial membrane of the shoulder joint downward in the intertubercular groove to surround the tendon of the long head of the biceps. SYN: vagina tendinis intertubercularis [TA] . s. of Key and Retzius SYN: endoneurium. Mauthner s. SYN: axolemma. medullary s. SYN: myelin s.. microfilarial s. the membrane surrounding the embryos of certain blood-borne microfilariae, such as Wuchereria, Brugia, and Loa of humans; thought to be derived from the vitelline membrane. mitochondrial s. the spirally arranged mitochondria in the middle piece of a spermatozoon; provides energy for the movement of the tail. mucous s. of tendon SYN: synovial tendon s.. myelin s. the lipoproteinaceous envelope in vertebrates surrounding most axons of more than 0.5-μm diameter; it consists of a double plasma membrane wound tightly around the axon in a variable number of turns, and supplied by oligodendroglia cells (in the brain and spinal cord) or Schwann cells (in peripheral nerves); unwound, the double membrane would appear as a sheetlike cell expansion that is empty of cytoplasm but for a few narrow cytoplasmic strands corresponding to apparent interruptions of the regular myelin structure, the incisures of Schmidt-Lanterman; the myelin s. of each axon is composed of a fairly regular longitudinal sequence of segments, each corresponding to the length of s. supplied by a single oligodendroglia or Schwann cell; in the short interval between each two neighboring segments, the nodes of Ranvier, the axon is unmyelinated even though enclosed by complex finger-like plasmatic expansions of the neighboring oligodendroglia or Schwann cells. SYN: medullary s.. Neumann s. SYN: dentinal s.. neurovascular s. fibrous tissue enveloping and binding together arteries, their accompanying veins (venae comitantes) and nerves that run together; often it is merely the adventitious tissue of the neurovascular structures, but may be highly developed as a distinct fascial layer ( e.g., in the case of the carotid or axillary sheaths). notochordal s. the fibrous outer covering of the notochord. outer s. of optic nerve [TA] the outer s. around the optic nerve, continuous with the dura mater. SYN: vagina externa nervi optici [TA] , dural s. of optic nerve, external s. of optic nerve. palmar carpal tendinous sheaths [TA] three synovial tendon sheaths that allow movement of tendons across the anterior aspect of the wrist, deep to or within the flexor retinaculum; they are the: (1) tendinous s. of flexor pollicis longus (muscle) [TA] (vagina tendinis musculi flexoris pollicis longi [TA]); (2) tendinous s. of flexor carpi radialis (muscle) [TA] (vagina tendinis musculi flexoris carpi radialis [TA]); and (3) common flexor s. [TA] (vagina communis tendineum musculorum flexorum [TA]). SYN: vaginae tendinum carpales palmares [TA] . parotid s. SYN: parotid fascia. periarterial lymphatic s. (PALS) the accumulation of lymphocytes investing the central arteries of the spleen and comprising the white pulp. plantar tendon s. of fibularis longus muscle [TA] the synovial s. surrounding the tendon of the peroneus longus in its course across the sole of the foot. SYN: vagina tendinis musculi fibularis longi plantaris [TA] , plantar tendon s. of peroneus longus muscle&star, vagina tendinis musculi peronei longi plantaris&star. plantar tendon s. of peroneus longus muscle plantar tendon s. of fibularis longus muscle. prostatic s. loose fibrous, partly vascular enclosure of the prostate and its dense (true) fibrous capsule; it is continuous inferiorly with the superior fascia of the urogenital diaphragm and posteriorly becomes part of the rectovesical septum; it contains the prostatic venous plexus. rectus s. [TA] s. of the rectus abdominis, formed by the aponeuroses of the three anterolateral muscles of the abdominal wall that split to enclose the rectus and fuse medially to form the linea alba; it consists of an anterior lamina and a posterior lamina, the latter being absent below the arcuate line. SEE ALSO: aponeurosis of external oblique muscle, aponeurosis of internal oblique muscle. SYN: vagina musculi recti abdominis [TA] . resectoscope s. an operative s. through which transurethral electroresection of bladder tumors or prostate gland can be performed. root s. one of the epidermic layers of the hair follicle: external root s. is continuous with the stratum basale and stratum spinosum of the epidermis; internal root s. comprises the cuticle of the internal roots, Huxley layer, and Henle layer. Rouget-Neumann s. the amorphous ground substance between an osteocyte and the lacunar or canalicular wall. Scarpa s. SYN: cremasteric fascia. s. of Schwann SYN: neurilemma. s. of Schweigger-Seidel SYN: ellipsoid. s. of styloid process [TA] a crest of bone (edge of the tympanic portion of the temporal bone) running from the front and medial side of the mastoid process to the spine of the sphenoid; it splits to ensheath the base of the styloid process. SYN: vagina processus styloidei [TA] , vaginal process. synovial s. [TA] See synovial tendon s., vagina synovialis trochleae, synovial sheaths of digits of hand, synovial sheaths of toes. SYN: vagina synovialis [TA] . synovial sheaths of digits of foot SYN: synovial sheaths of toes. synovial sheaths of digits of hand [TA] the synovial sheaths that enclose the flexor tendons of the fingers and line the inside of the fibrous tendon sheaths. SYN: vaginae synoviales digitorum manus [TA] . synovial tendon s. [TA] a s. of synovial membrane enveloping certain of the tendons; it contains a small amount of synovial fluid. SYN: vagina synovialis tendinis [TA] , mucous s. of tendon, theca tendinis, vagina mucosa tendinis, vaginal synovial membrane. synovial sheaths of toes [TA] similar in structure to the corresponding sheaths of the hand. SYN: vaginae tendinum digitorum pedis [TA] , synovial sheaths of digits of foot. tail s. the fibrous envelope in the tail of a spermatozoon. tendinous s. of abductor pollicis longus and extensor pollicis brevis muscles [TA] the dorsal carpal synovial tendinous s. lining the compartment of the extensor retinaculum that contains the abductor pollicis longus and extensor pollicis brevis tendons. SYN: vagina tendinum musculorum abductoris longi et extensoris brevis pollicis [TA] . tendinous s. of extensor carpi radialis muscles [TA] the dorsal carpal synovial tendon s. lining the compartment of the extensor retinaculum containing the tendons of the extensor carpi radialis longus and brevis muscles. SYN: vagina tendinum musculorum extensorum carpi radialium [TA] . tendinous s. of extensor carpi ulnaris muscle [TA] the dorsal carpal synovial tendon s. surrounding the tendon of the extensor carpi ulnaris in its course deep to the extensor retinaculum. SYN: vagina tendinis musculi extensoris carpi ulnaris [TA] , peritenon. tendinous s. of extensor digiti minimi muscle [TA] the dorsal carpal synovial tendon s. surrounding the tendon of the extensor digiti minimi in its passage deep to the extensor retinaculum. SYN: vagina tendinis musculi extensoris digiti minimi [TA] . tendinous s. of extensor digitorum and extensor indicis muscles [TA] the dorsal carpal synovial tendon s. that surrounds the four tendons of the extensor digitorum muscle and the tendon of the extensor indicis deep to the extensor retinaculum. SYN: vagina tendinum musculorum extensoris digitorum et extensoris indicis [TA] . tendinous s. of extensor digitorum longus muscle of foot [TA] the anterior tarsal synovial tendon s. that surrounds the tendons of the extensor digitorum longus muscle and the peroneus tertius in their passage across the ankle. SYN: vagina tendinum musculi extensoris digitorum pedis longi [TA] . tendinous s. of extensor hallucis longus muscle [TA] the anterior tarsal synovial tendon s. that surrounds the tendon of the extensor hallucis longus in its passage across the ankle. SYN: vagina tendinis musculi extensoris hallucis longi [TA] . tendinous s. of extensor pollicis longus muscle [TA] the dorsal carpal synovial tendon s. surrounding the extensor pollicis longus tendon in its passage deep to the extensor retinaculum. SYN: vagina tendinis musculi extensoris pollicis longi [TA] . tendinous s. of flexor carpi radialis muscle [TA] the palmar carpal synovial tendon s. enclosing the tendon of the flexor carpi radialis as it crosses the wrist. SYN: vagina tendinis musculi flexoris carpi radialis [TA] . tendinous s. of flexor digitorum longus muscle (of foot) [TA] the tibial tarsal synovial tendon s. that envelops the flexor digitorum longus tendons as they pass into the foot deep to the flexor retinaculum. SYN: vagina tendinum musculi flexoris digitorum pedis longi [TA] . tendinous s. of flexor hallucis longus muscle [TA] the tibial tarsal synovial tendon s. that envelops the tendon of the flexor hallucis longus as it passes into the foot deep to the flexor retinaculum. SYN: vagina tendinis musculi flexoris hallucis longi [TA] . tendinous s. of flexor pollicis longus muscle [TA] the palmar carpal synovial tendon s. that envelops the tendon of the flexor pollicis longus in its course through the carpal canal; it is continuous with the digital s. of the thumb, the two generally being considered as one s.. SYN: vagina tendinis musculi flexoris pollicis longi [TA] , radial bursa. tendinous s. of superior oblique muscle [TA] the synovial s. enclosing the tendon of the superior oblique muscle as it passes through the trochlea. SYN: vagina tendinis musculi obliqui superioris [TA] , synovial trochlear bursa, trochlear synovial bursa, vagina synovialis trochleae. tendinous s. of tibialis anterior muscle [TA] the anterior tarsal synovial tendon s., deep to the extensor retinaculum, that surrounds the tendon of the tibialis anterior as it crosses the ankle. SYN: vagina tendinis musculi tibialis anterioris [TA] . tendinous s. of tibialis posterior muscle [TA] the tibial tarsal synovial tendon s. surrounding the tendon of the tibialis posterior as it passes into the foot deep to the flexor retinaculum. SYN: vagina tendinis musculi tibialis posterioris [TA] . s. of thyroid gland covering of the thyroid gland external to its capsule formed by a splitting of the pretracheal layer of deep cervical fascia at the gland's posterior border; the anterior lamina covers the gland anterolaterally, attaching to the arch of the cricoid cartilage superior to the isthmus of the gland (causing it to move with the trachea during elevation/depression of the larynx); the posterior lamina passes posterior to the esophagus to blend with the buccopharyngeal fascia; inferiorly, the s. extends along the inferior thyroid veins to open into the superior mediastinum (hence, expansion of the thyroid, as by goiter, can take this direction). tibial tarsal tendinous sheaths [TA] synovial tendon sheaths that allow movement of tendons across the medial side of the tarsal bones, deep to flexor retinaculum; included are (1) the tendinous s. (vagina tendinis/tendinum musculi...) of flexor digitorum longus (muscle) [TA] (...flexoris digitorum longi [TA]); (2) the tibialis posterior (muscle) [TA] (...tibialis posterioris [TA]); and (3) the flexor hallucis longus (muscle) [TA] (...flexoris hallucis longi [TA]). SYN: vaginae tendinum tarsales tibialis [TA] . vascular sheaths fibrous envelopes ensheathing the arteries with their accompanying veins and sometimes nerves as well. SYN: sheaths of vessels, vaginae vasorum. sheaths of vessels SYN: vascular sheaths. Waldeyer s. the tubular space between the bladder wall and the intramural portion of the ureter as it courses obliquely through this structure; actually a space and not a true s.. SYN: Waldeyer space.

Sheehan
Harold L., British pathologist, *1900. See S. syndrome.

Sheldon
J.H., English pediatrician, 1920–1964. See Freeman-S. syndrome.

shelf
In anatomy, a structure resembling a s.. Blumer s. SYN: rectal s.. dental s. SYN: dental ledge. palatal s. a medially directed outgrowth of the embryonic maxilla; when fused with its opposite number it forms the secondary palate. rectal s. a s. palpable by rectal examination, due to metastatic tumor cells gravitating from an abdominal cancer and growing in the rectovesical or rectouterine pouch. SYN: Blumer s.. vocal s. SYN: vocal fold.




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