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Medical Dictionary


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lacus, pl .lacus (la′kus) [TA]
SYN: lake (1) . [L. lake] l. lacrimalis [TA] SYN: lacrimal lake. l. seminalis SYN: seminal lake.

LAD
Abbreviation for leukocyte adhesion deficiency.

Ladd
William E., U.S. pediatric surgeon, 1880–1967. See L. band, L. operation.

Ladd-Franklin
Christine, U.S. psychologist, 1847–1930. See Ladd-Franklin theory.

Laelaps echidninus (le′laps e-kid-ni′nus)
The spiny rat mite, a common worldwide ectoparasite of the wild Norway rat and occasionally found on the house mouse, cotton rat, and other rodents; it is the natural vector of Hepatozoon muris and can transmit the agent of tularemia experimentally. Junin virus has been isolated from this species in South America.

Laënnec
René T.H., French physician, 1781–1826. See L. cirrhosis, L. pearls, under pearl.

laetrile (la′e-tril)
An allegedly antineoplastic drug consisting chiefly of amygdalin derived from apricot pits; its antitumor effect is unproven.

laev-
See levo-.

Lafora
Gonzalo Rodriguez, Spanish neurologist, 1887–1971. See L. body, L. body disease, L. disease.

lag
1. To move or progress more slowly than normal; to fall behind. 2. The act or condition of falling behind. 3. The time interval between a change in one variable and a consequent change in another variable. anaphase l. slowing or arrest in the normal migration of chromosomes during anaphase, resulting in such chromosomes being excluded from one of the daughter cells. homeostatic l. the interval in a homeostatic process between a change of the trait controlled and the appropriate response, due to afferent, efferent, and central components. The l. may be a pure random variable, e.g., the waiting time of an exponential process or the sum of several such processes taking any value greater than zero but with a mean considerably greater than zero; sometimes it may be deterministic or almost so and with a minimum sharply defined and greater than zero for anatomical reasons. For instance, the partial pressures of oxygen and carbon dioxide are controlled in the lungs but based on afferent information obtained from the carotid body that is already dated because of the circulation time of ten seconds or so between the two sites.

lagena, pl .lagenae (la-je′na, -je-ne)
1. SYN: cupular cecum of the cochlear duct. 2. One of the three parts of the membranous labyrinth of the inner ear of lower vertebrates; in mammals, the l. becomes the cochlea. [L. flask]

lagging
Retarded or diminished ventilatory movement of the affected side of the chest due to pleural disease with muscle splinting or collapse of a lung.

lagomorph (la′go-morf)
A member of the order Lagomorpha.

Lagomorpha (la-go-mor′fa)
An order of herbivorous mammals (class Eutheria) resembling rodents (order Rodentia) but having two pairs of upper incisors one behind the other; it includes the rabbits, hares, and pikas. [G. lagos, hare, + morphe, form]

lagophthalmia (lag-of-thal′me-a)
See lagophthalmos.

lagophthalmos, lagophthalmia (lag-of-thal′mos, lag-of-thal′me-a)
A condition in which a complete closure of the eyelids over the eyeball is difficult or impossible. [G. lagos, hare + ophthalmos, eye]

Lagrange
Pierre F., French ophthalmologist, 1857–1928.

Lahey
Frank H., U.S. surgeon, 1880–1935. See L. forceps.

LAK
Abbreviation for lymphokine activated killer cells.

lake (lak) [TA]
1. A small collection of fluid. SYN: lacus [TA] . 2. To cause blood plasma to become red as a result of the release of hemoglobin from the erythrocytes, as when the latter are suspended in water. SEE ALSO: lacuna. [A.S. lacu, fr. L. lacus, l.] capillary l. the total mass of blood contained in capillary vessels. lacrimal l. [TA] the small cisternlike area of the conjunctiva at the medial angle of the eye, in which the tears collect after bathing the anterior surface of the eyeball and the conjunctival sac. SYN: lacus lacrimalis [TA] , lacrimal bay. lateral lakes SYN: lateral lacunae of superior sagittal sinus, under lacuna. seminal l. the vault of the vagina after insemination. SYN: lacus seminalis. subchorial l. SYN: subchorial space. venous lakes 1. blue-purple, thin-walled, dilated blood vessels that blanch on pressure, found commonly in the ears and less often on the lips and on the face and neck of elderly sun-damaged men; 2. discontinuous venous cavities or channels; Cf.:marginal sinuses of placenta, under sinus. 3. in skull radiography, round to oval radiolucent foci in the frontal or parietal bones caused by dilated diploic venous channels.

Laki-Lorand factor
See under factor.

laky (la′ke)
Pertaining to the transparent bright red appearance of blood serum or plasma, developing as a result of hemoglobin being released from destroyed red blood cells.

laliatry (la-li′a-tre)
The study and treatment of speech disorders. [G. lalia, speech, chatter, + iatria, cure]

laliophobia (lal′e-o-fo′be-a)
Morbid fear of speaking or stuttering. [G. lalia, speech, + phobos, fear]

Lallemand
Claude F., French surgeon, 1790–1853. See L. bodies, under body, Trousseau-L. bodies, under body.

lalling (lal′ing)
A form of stammering in which the speech is almost unintelligible. [G. laleo, to chatter]

Lallouette
Pierre, French physician, 1711–1792. See L. pyramid.

lalochezia (lal-o-ke′ze-a)
Emotional discharge gained by uttering indecent or filthy words. [G. lalia, speech, + chezo, to relieve oneself]

lalognosis (lal′og-no′sis)
Understanding and knowledge of speech. [G. lalia, speech, + gnosis, knowledge]

laloplegia (la-lo-ple′je-a)
Paralysis of the muscles concerned in the mechanism of speech. [G. lalia, speech, + plege, a stroke]

Lamarck
Jean-Baptiste P.A., French botanist, zoologist, and biologic philosopher, 1744–1829. See lamarckian theory.

Lamaze
Fernand, French obstetrician, 1890–1957. See L. method.

LAMB
Acronym for lentigines, atrial myxoma, mucocutaneous myxomas, and blue nevi. See L. syndrome.

Lam B
Outer membrane protein of Gram-negative bacteria.

lambda (lam′da)
1. The 11th letter of the Greek alphabet, &l.;. 2. The craniometric point at the junction of the sagittal and lambdoid sutures.

lambdacism (lam′da-sizm)
1. Mispronunciation or disarticulation of the letter l. 2. Substitution of the letter l for the letter r. [G. lambda, the letter L]

lambdoid (lam′doyd)
Resembling the Greek letter lambda (λ), as does the l. suture. [lambda + G. eidos, resemblance]

Lambert
Edward H., U.S. physician, *1915. See L.-Eaton syndrome, Eaton-L. syndrome.

lambert (lam′bert)
A unit of brightness; the brightness of a perfectly diffusing surface emitting or reflecting a total luminous flux of 1 lumen/sq cm of surface. [J.H. L., German physicist and mathematician, 1728–1777]

Lamblia intestinalis (lam′ble-a in-tes-ti-na′lis)
Old term for Giardia lamblia, still frequently used, especially by protozoologists in the former Soviet Union.

lambliasis (lam-bli′a-sis)
SYN: giardiasis.

lambo lambo (lam′bo-lam′bo)
SYN: tropical pyomyositis.

Lambrinudi
Constantine, British orthopedic surgeon, 1890–1943. See L. operation.

lamella, pl .lamellae (la-mel′a, -mel′e) [TA]
1. [TA] A thin sheet or layer (such as occurs in compact bone) or sublayer. 2. A preparation in the form of a medicated gelatin disk, used as a means of making local applications to the conjunctiva in place of solutions. SYN: discus [TA] , disk (2) [TA] . [L. dim. of lamina, plate, leaf] annulate lamellae several pairs of parallel, smooth membranes, each pair containing regularly spaced pores resembling those of the nuclear envelope; they occur in germ cells, embryonic cells, and neoplastic cells. articular l. the compact layer of bone on its articular surface that is firmly attached to the overlying articular cartilage. l. of bone a concentric, circumferential, or interstitial l.. circumferential l. a bony l. that encircles the outer or inner surface of a bone. concentric l. one of the concentric tubular layers of bone surrounding the central canal in an osteon. SYN: haversian l.. cornoid l. a narrow vertical column of parakeratosis in the epidermal stratum corneum; characteristic of porokeratosis. elastic l. a thin sheet or membrane composed of elastic fibers; distinguished from elastic membrane, which usually refers to a condensed mass of fibers, as in an artery, whereas an elastic l. may be a looser elastic layer such as found in a vein or the respiratory tract. enamel l. an organic defect in enamel; a thin, leaflike structure that extends from the enamel surface toward the dentinoenamel junction. glandulopreputial l. a layer of embryonic epithelial tissue that gives rise to the prepuce. ground l. SYN: interstitial l.. haversian l. SYN: concentric l.. intermediate l. SYN: interstitial l.. interstitial l. one of the lamellae of partially resorbed osteons occurring between newer, complete osteons. SYN: ground l., intermediary system, intermediate l.. triangular l. SYN: tela choroidea of third ventricle. l. tympanica (laminae spiralis ossei) [TA] SYN: tympanic l. (of osseous spiral lamina). tympanic l. (of osseous spiral lamina) [TA] the thinner of two plates of bone, incompletely separated from each other by canals for peripheral fibers from the spiral (cochlear) ganglion, that together comprise the osseous spiral lamina; this plate lies on the side of the scala tympani, forming a portion of its wall. SYN: l. tympanica (laminae spiralis ossei) [TA] . l. vestibularis (laminae spiralis ossei) [TA] SYN: vestibular l. (of osseous spiral lamina). vestibular l. (of osseous spiral lamina) [TA] the thicker of two plates of bone, incompletely separated from each other by canals for peripheral fibers from the spiral (cochlear) ganglion, that together comprise the osseous spiral lamina; this plate lies on the side of the scala vestibuli; a thickening of the periosteum, the spiral limbus, is attached to the vestibular l. within the cochlear duct. SYN: l. vestibularis (laminae spiralis ossei) [TA] . vitreous l. SYN: lamina basalis choroideae.

lamellar (lam′e-lar, la-mel′ar)
1. Arranged in thin plates or scales. SYN: lamellate, lamellated. 2. Relating to lamellae.

lamellate, lamellated (lam′e-lat, -ed)
SYN: lamellar (1) .

lamellipodium, pl .lamellipodia (la-mel-i-po′de-um, -a)
A cytoplasmic veil produced on all sides of migrating polymorphonuclear leukocytes.

lamina, pl .laminae (lam′i-na, lam′i-ne) [TA]
SYN: plate (1) . SEE ALSO: layer, stratum. [L] l. affixa [TA] that part of the medial ependymal wall of the lateral ventricle of the embryonic brain that in later development becomes adherent to the superior surface of the thalamus and thus comes to form the floor of the central part of the lateral ventricle; it covers the thalamostriate and choroidal veins. l. alaris SYN: alar l. of neural tube. alar l. of neural tube the dorsal division of the lateral walls of the neural tube in the embryo; it gives rise to neurons relaying afferent impulses to higher centers; in the adult such neurons compose the sensory nuclei of the spinal cord and brainstem. SYN: alar plate of neural tube, dorsolateral plate of neural tube, l. alaris, l. dorsalis, wing plate. laminae albae cerebelli layers of white substance seen on section of the cerebellum. SYN: laminae medullares cerebelli. l. anterior fasciae thoracolumbalis [TA] SYN: anterior layer of thoracolumbar fascia. anterior limiting l. [TA] the periphery of the cornea marking the termination of Descemet membrane and the anterior border of the trabecular meshwork; an important landmark in gonioscopy. SYN: l. limitans anterior [TA] , anterior limiting ring, Schwalbe ring. l. anterior vaginae musculi recti abdominis SYN: anterior layer of rectus sheath. l. arcus vertebrae [TA] SYN: l. of vertebral arch. basal l. 1. an amorphous extracellular layer applied to the basal surface of epithelium and also investing muscle cells, fat cells, and Schwann cells; thought to be a selective filter and to serve both structural and morphogenetic functions. It is composed of a 20–100 nm network of file filaments called the l. densa which appears dense in the electron microscope, and on either side of this layer is a less dense layer called the l. rarae; SEE ALSO: basement membrane, l. densa. 2. SYN: l. densa. basal l. of choroid [TA] SYN: l. basalis choroideae. basal l. of ciliary body [TA] the inner layer of the ciliary body, continuous with the basal layer of the choroid and supporting the pigment epithelium of the ciliary retina. SYN: l. basilaris corporis ciliaris [TA] , basal layer of ciliary body, l. basalis corporis ciliaris. basal l. of cochlear duct [TA] the membrane extending from the bony spiral membrane to the basilar crest of the cochlea; it forms the greater part of the floor of the cochlear duct separating the latter from the scala tympani and it supports the organ of Corti. SYN: l. basilaris ductus cochlearis [TA] , basilar l., basilar membrane of cochlear duct, l. basilaris cochleae, membrana basilaris. l. basalis SYN: basal l. of neural tube. l. basalis choroideae [TA] the transparent, nearly structureless inner layer of the choroid in contact with the pigmented layer of the retina. SYN: basal l. of choroid [TA] , basal layer of choroid [TA] , Bruch membrane, Henle membrane, l. vitrea, vitreous lamella, vitreous membrane (3) . l. basalis corporis ciliaris SYN: basal l. of ciliary body. basal l. of neural tube the ventral division of the lateral walls of the neural tube in the embryo; it contains neuroblasts giving rise to somatic and visceral motor neurons. SYN: basal plate of neural tube, l. basalis, l. ventralis, ventral plate of neural tube. basal l. of semicircular duct SYN: basal membrane of semicircular duct. basement l. SYN: basement membrane. basilar l. SYN: basal l. of cochlear duct. l. basilaris cochleae SYN: basal l. of cochlear duct. l. basilaris corporis ciliaris [TA] SYN: basal l. of ciliary body. l. basilaris ductus cochlearis [TA] SYN: basal l. of cochlear duct. boundary l. a basement membrane-like structure that invests muscle cells, fat cells, and Schwann cells. SEE ALSO: basement membrane, basal l.. capillary l. of choroid [TA] the internal or deep portion of the choroidea of the eye, composed of a very close capillary network. SYN: l. choroidocapillaris [TA] , choriocapillaris, choriocapillary layer, entochoroidea, l. choriocapillaris, membrana choriocapillaris, Ruysch membrane. l. cartilaginis cricoideae [TA] SYN: l. of cricoid cartilage. l. cartilaginis thyroideae [TA] SYN: l. of thyroid cartilage. l. choriocapillaris SYN: capillary l. of choroid. l. choroidea SYN: epithelial l.. l. choroidea epithelialis SYN: epithelial l.. l. choroidocapillaris [TA] SYN: capillary l. of choroid. l. cinerea SYN: l. terminalis of cerebrum. l. cribrosa ossis ethmoidalis [TA] SYN: cribriform plate of ethmoid bone. l. cribrosa of sclera [TA] the portion of the sclera through which pass the fibers of the optic nerve. SYN: l. cribrosa sclerae [TA] , cribrous l., perforated layer of sclera. l. cribrosa sclerae [TA] SYN: l. cribrosa of sclera. cribrous l. SYN: l. cribrosa of sclera. l. of cricoid cartilage [TA] a quadrate plate forming the posterior part of the cricoid cartilage. It resembles the shield of a signet ring, the arch of the cricoid representing the remainder of the ring. SYN: l. cartilaginis cricoideae [TA] . deep l. SYN: deep layer. l. densa 1. the electron-dense layer of the basal l. as seen in the electron microscope; SEE ALSO: basement membrane. 2. the extraordinarily thick basal l. of the renal glomerulus. SYN: basal l. (2) . dental l. SYN: dental ledge. l. dentata SYN: vestibular lip of spiral limbus. dentogingival l. SYN: dental ledge. l. dorsalis SYN: alar l. of neural tube. l. dura the hard layer lining the dental alveoli. l. elastica anterior SYN: anterior limiting layer of cornea. l. elastica posterior SYN: posterior limiting l. of cornea. elastic laminae of arteries 1) external: the layer of elastic connective tissue lying immediately outside the smooth muscle of the tunica media; 2) internal: a fenestrated layer of elastic tissue of the tunica intima. SYN: elastic layers of arteries, Henle fenestrated elastic membrane. l. epiphysialis [TA] SYN: epiphysial plate. episcleral l. SYN: episcleral layer of fibrous layer of eyeball. l. episcleralis [TA] SYN: episcleral layer of fibrous layer of eyeball. epithelial l. the layer of modified ependymal cells that forms the inner layer of the tela choroidea, facing the ventricle. SYN: epithelial choroid layer, l. choroidea epithelialis, l. choroidea, l. epithelialis. l. epithelialis SYN: epithelial l.. l. externa calvaria [TA] SYN: external table of calvaria. l. externa cranii SYN: external table of calvaria. external medullary l. [TA] See medullary laminae of thalamus. l. fibrocartilaginea interpubica SYN: interpubic disk. l. fibroreticularis a layer of the basement membrane in continuity with associated connective tissue; it is often discontinuous and may be lacking entirely in some cases. l. fusca of sclera SYN: suprachoroid l. of sclera. l. fusca sclerae [TA] SYN: suprachoroid l. of sclera. hepatic laminae the plates of liver cells that radiate from the center of the liver lobule. l. horizontalis ossis palatini [TA] SYN: horizontal plate of palatine bone. l. interna calvariae [TA] SYN: internal table of calvaria. l. interna cranii SYN: internal table of calvaria. internal medullary l. [TA] See medullary laminae of thalamus. l. interna ossium cranii SYN: vitreous table. iridopupillary l. embryonic precursor of the anterior stroma of the iris that forms the inner (posterior or deep) wall of the primary anterior chamber of the eye. Its central portion becomes attenuated as the pupillary membrane (membrana pupillaris [NA]). labiogingival l. a band of ectodermal epithelial cells growing into the mesenchyme of the embryonic jaws between the developing lip and the growing gingival elevation; it later opens to form the labiogingival groove. lateral l. of cartilage of pharyngotympanic (auditory) tube [TA] the narrow lateral portion of the cartilaginous part of the pharyngotympanic (auditory) tube. SYN: l. lateralis cartilaginis tubae auditivae [TA] , l. lateralis cartilaginis tubae auditoriae&star, lateral cartilaginous plate, lateral plate of cartilaginous auditory tube. l. lateralis cartilaginis tubae auditivae [TA] SYN: lateral l. of cartilage of pharyngotympanic (auditory) tube. l. lateralis cartilaginis tubae auditoriae lateral l. of cartilage of pharyngotympanic (auditory) tube. l. lateralis processus pterygoidei [TA] SYN: lateral pterygoid plate. lateral medullary l. [TA] of lentiform nucleus a thin, sharply defined layer of fibers separating the putamen from the globus pallidus. SYN: l. medullaris lateralis nuclei lentiformis [TA] . l. of lens one of a series of concentric layers composed of the lens fibers that make up the substance of the lens. l. limitans anterior [TA] SYN: anterior limiting l.. l. limitans anterior corneae SYN: anterior limiting layer of cornea. l. limitans posterior corneae SYN: posterior limiting l. of cornea. l. lucida the lightly staining layer of the basement membrane in contact with the plasmalemma of epithelial cells or other cells having an investment of basement membrane. medial l. of cartilage of pharyngotympanic (auditory) tube [TA] the broad medial portion of the cartilaginous part of the pharyngotympanic (auditory) tube. SYN: l. medialis cartilaginis tubae auditivae [TA] , l. medialis cartilaginis tubae auditoriae&star, medial cartilaginous plate, medial plate of cartilaginous auditory tube. l. medialis cartilaginis tubae auditivae [TA] SYN: medial l. of cartilage of pharyngotympanic (auditory) tube. l. medialis cartilaginis tubae auditoriae medial l. of cartilage of pharyngotympanic (auditory) tube, medial l. of cartilage of pharyngotympanic (auditory) tube. l. medialis processus pterygoidei [TA] SYN: medial pterygoid plate. medial medullary l. [TA] of lentiform nucleus a fiber layer separating the medial and lateral segments of the globus pallidus. SYN: l. medullaris medialis nuclei lentiformis [TA] . laminae medullares cerebelli SYN: laminae albae cerebelli. laminae medullares thalami SYN: medullary laminae of thalamus. l. medullaris lateralis [TA] See medullary laminae of thalamus. l. medullaris lateralis nuclei lentiformis [TA] SYN: lateral medullary l. [TA] of lentiform nucleus. l. medullaris medialis [TA] See medullary laminae of thalamus. l. medullaris medialis nuclei lentiformis [TA] SYN: medial medullary l. [TA] of lentiform nucleus. medullary laminae of thalamus layers of myelinated fibers that appear on transverse sections of the thalamus; the l. medullaris lateralis [TA] (external medullary l. [TA]) marks the ventral and lateral borders of the thalamus and delimits it from the subthalamus and reticular nucleus of thalamus; the l. medullaris medialis [TA] (internal medullary l. [TA]) is interposed between the mediodorsal and ventral nuclei of the thalamus and encloses the intralaminar nuclei (centromedian, paracentral, and central lateral nuclei). SYN: laminae medullares thalami, medullary layers of thalamus. l. membranacea cartilaginis tubae auditivae [TA] SYN: membranous l. of cartilage of pharyngotympanic (auditory) plate. l. membranacea cartilaginis tubae auditoriae membranous l. of cartilage of pharyngotympanic (auditory) plate. membranous l. of cartilage of pharyngotympanic (auditory) plate [TA] the connective tissue membrane that, with the lateral and medial laminae, completes the lateral and inferior walls of the cartilaginous part of the pharyngotympanic (auditory) tube. SYN: l. membranacea cartilaginis tubae auditivae [TA] , l. membranacea cartilaginis tubae auditoriae&star, membranous layer. l. of mesencephalic tectum the roofplate of the mesencephalon formed by the quadrigeminal bodies. SYN: l. tecti [TA] , tectal plate [TA] , tectum mesencephali [TA] , l. quadrigemina, quadrigeminal l., quadrigeminal plate, tectum of midbrain. l. modioli cochleae [TA] SYN: l. of modiolus of cochlea. l. of modiolus of cochlea [TA] a bony plate, the continuation of the modiolus and of the septum between the convolutions of the spiral canal of the cochlea extending upward toward the cupola, forming with the hamulus the helicotrema. SYN: l. modioli cochleae [TA] , plate of modiolus. l. molecularis corticis cerebri [TA] SYN: molecular layer of cerebral cortex. l. muscularis mucosae SYN: muscularis mucosae. nuclear l. a protein-rich layer lining the inner surface of the nuclear membrane in interphase cells. orbital l. of ethmoid bone SYN: orbital plate of ethmoid bone. l. orbitalis ossis ethmoidalis [TA] SYN: orbital plate of ethmoid bone. osseous spiral l. [TA] a double plate of bone winding spirally around the modiolus dividing the spiral canal of the cochlea incompletely into two, scala tympani and scala vestibuli; between the two plates of this l., the fibers of the cochlear nerve reach the spiral organ (of Corti). SYN: l. spiralis ossea [TA] , spiral plate. l. papyracea SYN: orbital plate of ethmoid bone. l. parietalis [TA] SYN: parietal layer. l. parietalis pericardii serosi [TA] SYN: parietal layer of serous pericardium. l. parietalis tunicae vaginalis testis [TA] SYN: parietal layer of tunica vaginalis of testis. periclaustral l. SYN: external capsule. l. perpendicularis [TA] SYN: perpendicular plate. l. perpendicularis ossis ethmoidalis [TA] SYN: perpendicular plate of ethmoid bone. l. perpendicularis ossis palatini [TA] SYN: perpendicular plate of palatine bone. posterior limiting l. of cornea [TA] a transparent homogeneous acellular layer between the substantia propria and the endothelial layer of the cornea; considered to be a highly developed basement membrane. SYN: Descemet membrane, Duddell membrane, entocornea, hyaloid membrane, l. elastica posterior, l. limitans posterior corneae, membrana hyaloidea, membrana vitrea, posterior elastic layer, posterior limiting layer of cornea, tunica vitrea, vitreous membrane (1) . l. posterior vaginae musculi recti abdominis [TA] SYN: posterior layer of rectus sheath. l. pretrachealis fasciae cervicalis [TA] SYN: pretracheal layer of cervical fascia. l. prevertebralis fasciae cervicalis [TA] SYN: prevertebral layer of cervical fascia. primary dental l. SYN: dental ledge. l. profunda [TA] SYN: deep layer. l. profunda fasciae temporalis [TA] SYN: deep layer of temporal fascia. l. profunda fasciae thoracolumbalis anterior layer of thoracolumbar fascia. l. profunda musculi levatoris palpebrae superioris SYN: deep layer of levator palpebrae superioris. l. propria [TA] the layer of connective tissue underlying the epithelium of a mucous membrane. SYN: l. propria mucosae. l. propria mucosae SYN: l. propria. pterygoid laminae lateral pterygoid plate, medial pterygoid plate. l. quadrigemina SYN: l. of mesencephalic tectum. quadrigeminal l. SYN: l. of mesencephalic tectum. l. rara the relatively electron-lucent layer on either side of the l. densa of the basement membrane. reticular l. 1. a major component of the basement membrane, as seen by light microscopy; it consists largely of reticular fibers and ground substance. 2. the connective tissue plate in which the hair-bearing ends of the auditory sensory cells of the organ of Corti are embedded. retrorectal l. of endopelvic fascia SYN: presacral fascia. retrorectal l. of hypogastric sheath SYN: presacral fascia. l. retrorectalis fasciae endopelvicae SYN: presacral fascia. l. of Rexed a division of the gray matter of the spinal cord into nine laminae (I–IX) and a gray area around the central canal (area X) based on cytoarchitectural features; the dorsal (posterior) horn is composed of laminae I–VI, the intermediate zone of l. VII, and the ventral horn of laminae VIII and IX; general correlation of laminae with some of the major nuclei: I, posteromarginal nucleus; II, substantia gelatinosa; III and IV, nucleus proprius cornu dorsalis; V and VI, sometimes described as containing the spinal reticular formation; VII, Clarke nucleus, intermediolateral cell column; VIII, commissural nuclei, interneurons; IX, motor nuclei of ventral horn. rostral l. a whitish line appearing on perfectly median sections of the brain as a thin bridge connecting the rostrum of the corpus callosum with the l. terminalis; the rostral l. contains no commissural fibers; instead, it corresponds to the line along which the pia mater reflects from the medial surface of one hemisphere to that of the other. SYN: l. rostralis, rostral layer, taeniola corporis callosi. l. rostralis SYN: rostral l.. secondary spiral l. [TA] a ridge on the outer wall of the first turn of the cochlea opposite the spiral l.. SYN: l. spiralis secundaria [TA] , secondary spiral plate. l. septi pellucidi SYN: l. of septum pellucidum. l. of septum pellucidum one of the two thin layers of the transparent septum, which extend from the corpus callosum to the fornix; often separated from each other by a space, the cavity of septum pellucidum. SYN: l. septi pellucidi. spinal l. II gelatinous substance. l. spinalis II gelatinous substance. l. spiralis ossea [TA] SYN: osseous spiral l.. l. spiralis secundaria [TA] SYN: secondary spiral l.. successional l. an ectodermal bud on the labial side of the dental l. that develops into a permanent tooth. superficial l. SYN: superficial layer. l. superficialis [TA] SYN: superficial layer. l. superficialis fasciae cervicalis [TA] SYN: investing layer of cervical fascia. l. superficialis fasciae temporalis [TA] SYN: superficial layer of temporal fascia. l. superficialis musculi levatoris palpebrae superioris SYN: superficial layer of the levator palpebrae superioris. suprachoroid l. of sclera [TA] an exceedingly delicate layer of loose, pigmented connective tissue between the inner surface of the sclera and the outer surface of the choroid, connecting them; formerly, the l. fusca and suprachoroid l. were considered as two adjacent layers. SYN: l. fusca sclerae [TA] , brown layer, ectochoroidea, l. fusca of sclera, membrana fusca, suprachoroidea. l. supraneuroporica that part of the choroid membrane of the third ventricle that forms the roof of the foramen of Monro. l. tecti [TA] SYN: l. of mesencephalic tectum. l. terminalis [TA] SYN: l. terminalis of cerebrum. l. terminalis of cerebrum [TA] a thin plate passing upward from the optic chiasm and forming the rostral boundary of the third ventricle; membrane closing the rostral neuropore. SYN: l. terminalis [TA] , l. cinerea, terminal plate, velum terminale. l. of thyroid cartilage [TA] one of the paired (right and left) thin quadrilateral plates of the thyroid cartilage that are joined anteriorly and form an open angle posteriorly. SYN: l. cartilaginis thyroideae [TA] . tragal l. [TA] a longitudinal curved plate of cartilage, the beginning of the cartilaginous portion of the external acoustic meatus. SYN: l. tragi [TA] , l. of tragus. l. tragi [TA] SYN: tragal l.. l. of tragus SYN: tragal l.. vascular l. of choroid [TA] the external or superficial portion of the choroid of the eye containing the largest blood vessels. SYN: l. vasculosa choroideae [TA] , Haller vascular tissue, uvaeformis, vascular layer of choroid coat of eye, vascular layer. l. vasculosa choroideae [TA] SYN: vascular l. of choroid. l. ventralis SYN: basal l. of neural tube. l. of vertebral arch [TA] the flattened posterior portion of the vertebral arch extending between the pedicles and the midline, forming the dorsal wall of the vertebral foramen, and from the midline junction of which the spinous process extends. SYN: l. arcus vertebrae [TA] , neurapophysis. l. visceralis [TA] SYN: visceral layer. l. visceralis pericardii SYN: visceral layer of serous pericardium. l. visceralis tunicae vaginalis testis [TA] SYN: visceral layer of tunica vaginalis of testis. l. vitrea SYN: l. basalis choroideae.

laminagram (lam′i-na-gram)
An image made by laminagraphy (q.v.). SEE ALSO: tomography.




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