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Medical Dictionary - Dictionary of Medicine and Human Biology


Medical Dictionary


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seat (set)
A surface against which an object may rest to gain support. basal s. SYN: denture foundation area. rest s. SYN: rest area.

seatworm (set′werm)
SYN: pinworm.

sea wasp
SYN: Chiropsalmus quadrumanus.

seb-
See sebo-.

sebaceous (se-ba′shus)
Relating to sebum; oily; fatty. SYN: sebaceus. [L. sebaceus]

sebaceus (se-ba′shus)
SYN: sebaceous. [L.]

sebiagogic (seb′e-a-goj′ik)
SYN: sebiferous. [sebi- + G. agogos, leading]

sebiferous (se-bif′er-us)
Producing sebaceous matter. SYN: sebiagogic, sebiparous. [sebi- + L. fero, to bear]

Sebileau
Pierre, French anatomist, 1860–1953. See S. hollow, S. muscle.

sebiparous (se-bip′a-rus)
SYN: sebiferous. [sebi- + L. pario, to produce]

sebo-, seb-, sebi-
Sebum, sebaceous. [L. sebum, suet, tallow]

seborrhea (seb-o-re′a)
Overactivity of the sebaceous glands, resulting in an excessive amount of sebum. [sebo- + G. rhoia, a flow] s. capitis s. of the scalp. eczematoid s. seborrheic eczema in which lesions have lost definition and have become confluent, usually as a result of trauma and overzealous use of soap and medication. s. faciei, s. of face s. affecting especially the nose and forehead. s. furfuracea SYN: s. sicca (1) . s. oleosa a greasy condition of the skin due to excessive secretion of the sebaceous glands. s. sicca 1. an accumulation on the skin, especially the scalp, of dry scales; SYN: s. furfuracea. 2. SYN: dandruff. s. squamosa neonatorum seborrheic dermatitis in infants.

seborrheic (seb-o-re′ik)
Relating to seborrhea.

sebum (se′bum)
The secretion of the sebaceous glands. [L. tallow]

sec
Abbreviation for second.

Secernentasida (se-ser-nen-tas′i-da)
A class of nematodes possessing lateral canals opening into the excretory system and phasmids; it includes most of the familiar nematode parasites of humans and domestic animals, including the soil-borne nematodes, strongyles, and filiariae. SEE ALSO: Adenophorasida. SYN: Phasmidia, Secernentia. [L. secerno, to separate, hide]

Secernentia (se-ser-nen′she-a)
SYN: Secernentasida.

Seckel
Helmut P.G., German physician, *1900. See S. dwarfism, S. syndrome.

secobarbital (se-ko-bar′bi-tahl)
An obsolescent sedative and short-acting hypnotic; largely replaced by benzodiazepines.

secondaries (sek′on-dar-ez)
1. SYN: metastasis. 2. The lesions of secondary syphilis.

secosteroid (sek′o-ster′oyd)
A compound derived from a steroid in which there has been a ring cleavage. [L. seco, to cut, + steroid]

secreta (se-kre′ta)
Secretions. [L. neuter pl. of secretus, pp. of se-cerno, to separate]

secretagogue (se-kre′ta-gog)
An agent that promotes secretion; e.g., acetylcholine, gastrin, secretin. SYN: secretogogue. [secreta + G. agogos, drawing forth]

secretase (se-kre′tas)
A term used to describe a proteinase that acts on amyloid precursor protein to produce peptides that do not contain the entire amyloid β protein (a major constituent of the plaques found in Alzheimer disease), are soluble, and do not precipitate to produce amyloid.

secrete (se-kret′)
To elaborate or produce some physiologically active substance ( e.g., enzyme, hormone, metabolite) by a cell and to deliver it into blood, body cavity, or sap, either by direct diffusion, cellular exocytosis, or by means of a duct. [L. se-cerno, pp. -cretus, to separate]

secretin (se-kre′tin)
A hormone, formed by the epithelial cells of the duodenum under the stimulus of acid contents from the stomach, that incites secretion of pancreatic juice; used as a diagnostic aid in the diagnosis of pancreatic exocrine disease and as an adjunct in obtaining desquamated pancreatic cells for cytological examination. SYN: oxykrinin. [secrete + -in] s. family a class of hormones that are structurally and functionally similar to s.; E.G., s., glucagon, gastric inhibitory polypeptide, vasoactive intestinal polypeptide, and glicentin.

secretion (se-kre′shun)
1. Production by a cell or aggregation of cells (a gland) of a physiologically active substance and its movement out of the cell or organ in which it is formed. 2. The solid, liquid, or gaseous product of cellular or glandular activity that is stored in or used by the organism in which it is produced. Cf.:excretion. [L. secerno, pp. -cretus, to separate] cytocrine s. the transfer of secretory material from one cell to another, such as the transfer of melanin granules from melanocytes to epidermal cells. external s. a substance formed by a cell and transported outside the cell walls as a means of ridding the cell of the substance or as a messenger to affect the function of other cells. neurohumoral s. transmission of a nerve impulse across a synapse or to an end-organ by s. of a minute amount of a chemical transmitter such as acetylcholine.

secretogogue (se-kre′to-gog)
SYN: secretagogue.

secretomotor, secretomotory (se-kre′to-mo′ter, -mo′ter-e)
Stimulating secretion. [secrete + motor, mover]

secretor (se-kre′ter, tor)
An individual whose bodily fluids (saliva, semen, vaginal secretions) contain a water-soluble form of the antigens of the ABO blood group. Secretors constitute 80% of the population. In forensic medicine, the examination of fluids has enhanced the ability of law enforcement officials to develop identifying information about perpetrators and narrow a field of suspects.

secretory (se-kret′e-re, se′kre-tor-e)
Relating to secretion or the secretions.

sectile (sek′til, til)
1. Capable of being cut or divided. 2. Having the appearance of being divided. [L. sectilis, fr. seco, to cut]

sectio, pl .sectiones (sek′she-o, sek-she-o′nez) [TA]
In anatomy, a subdivision or segment. [L.]

section (sek′shun)
1. The act of cutting. 2. A cut or division. 3. A segment or part of any organ or structure delimited from the remainder. 4. A cut surface. 5. A thin slice of tissue, cells, microorganisms, or any material for examination under the microscope. SYN: microscopic s.. [L. sectio, a cutting, fr. seco, to cut] abdominal s. SYN: celiotomy. attached cranial s. SYN: attached craniotomy. axial s. SYN: transverse s.. cesarean s. incision through the abdominal wall and the uterus (abdominal hysterotomy) for extraction of the fetus. classical cesarean s. a cesarean s. in which the uterus is entered through a vertical fundal incision. coronal s. a cross s. attained by slicing, actually or through imaging techniques, the body or any part of the body or any anatomic structure in the coronal or frontal plane, i.e., in a vertical plane perpendicular to the median or sagittal plane. Since actual sectioning in the coronal plane results in an anterior and a posterior portion, an anatomic coronal s. may be a two-dimensional view of the cut surface of the posterior aspect of the anterior portion, or of the anterior aspect of the posterior portion. SYN: frontal s.. cross s. 1. a planar or two-dimensional view, diagram, or image of the internal structure of the body, part of the body, or any anatomic structure afforded by slicing, actually or through imaging (radiographic, magnetic resonance, or microscopic) techniques, the body or structure along a particular plane. Traditionally, “cross s.” referred to views resulting from slicing at right angles to the longitudinal axis of the structure (axial or transaxial), but in contemporary use, the term is applied when the structure is sliced in any given plane; 2. the slice or s. of a given thickness created by actual serial parallel cuts through a structure or by the application of imaging technique. detached cranial s. SYN: detached craniotomy. diagonal s. SYN: oblique s.. frontal s. SYN: coronal s.. frozen s. a thin slice of tissue cut from a frozen specimen, often used for rapid microscopic diagnosis. Latzko cesarean s. a cesarean s. in which the uterus is entered by paravesical blunt dissection without entering the peritoneal cavity. longitudinal s. a cross sectio attained by slicing in any plane parallel to the long or vertical axis, actually or through imaging techniques, the body or any part of the body or anatomic structure. Longitudinal sections include, but are not limited to, median, sagittal, and coronal sections. lower uterine segment cesarean s. a cesarean s. in which the uterus is entered in its lower segment by a transperitoneal approach. median s. a cross s. attained by slicing in the median plane, actually or through imaging techniques, the body or any part of the body which occupies or crosses the median plane or by slicing any generally symmetrical anatomic structure, such as a finger or a cell, in its midline. Since actual sectioning of the median plane results in a right and a left half, an anatomical median s. may be a two-dimensional view of the cut surface on the medial aspect of either half. SYN: midsagittal s.. microscopic s. SYN: s. (5) . midsagittal s. SYN: median s.. oblique s. a diagonal cross s. attained by slicing, actually or through imaging techniques, the body or any part of the body or anatomic structure, in any plane which does not parallel the longitudinal axis or intersect it at a right angle, i.e., which is neither longitudinal (vertical) nor transverse (horizontal). SYN: diagonal s.. parasagittal s. SYN: sagittal s.. perineal s. any s. through the perineum, either lateral or median lithotomy (operations of historical importance) or external urethrotomy. pituitary stalk s. transection of the neurovascular connection between the hypothalamus and the pituitary gland. Saemisch s. procedure of transfixing the cornea beneath an ulcer and then cutting from within outward through the base. sagittal s. a cross s. obtained by slicing, actually or through imaging techniques, the body or any part of the body, or any anatomic structure in the sagittal plane, i.e., in a vertical plane parallel to the median plane. Since actual sectioning in the sagittal plane results in a right and a left portion, an anatomical sagittal s. may be a two-dimensional view of the cut surface on the medial aspect of either portion. SYN: parasagittal s.. serial s. one of a number of consecutive microscopic sections. thin s., ultrathin s. a s. of tissue for electron microscopic examination; the specimen is fixed, typically in glutaraldehyde and/or in osmium tetroxide, embedded in a plastic resin, and sectioned at less than 0.1 μm in thickness with a glass or diamond knife in an ultramicrotome. transverse s. a cross s. obtained by slicing, actually or through imaging techniques, the body or any part of the body structure, in a horizontal plane, i.e., a plane which intersects the longitudinal axis at a right angle. Since actual sectioning in the transverse plane results in an inferior and a superior portion, an anatomical transverse s. may be a two-dimensional view of the cut surface on the inferior aspect of the superior portion, or of the superior aspect of the inferior portion. By convention, in medical imaging transverse sections demonstrate the former unless otherwise stated. SYN: axial s..

sectoranopia (sek′tor-an-o′pe-a)
Loss of vision in a sector of the visual field. [sector + G. an- priv. + opsis, vision]

sectorial (sek-tor′e-al)
1. Relating to a sector. 2. Cutting or adapted for cutting; denoting the carnassial or shearing molar and premolar teeth of carnivores. [L. sector, cutter]

secundigravida (sek′un-di-grav′i-da)
See gravida.

secundina, pl .secundinae (sek-un-di′na, -ne)
SYN: afterbirth. [L. secundinae, the afterbirth, fr. secundus, second]

secundines (sek′un-denz)
SYN: afterbirth. [L. secundinae, the afterbirth]

secundipara (sek′un-dip′a-ra)
See para.

sedate (se-dat′)
To bring under the influence of a sedative. [L. sedatus; see sedation]

sedation (se-da′shun)
1. The act of calming, especially by the administration of a sedative. 2. The state of being calm. [L. sedatio, to calm, allay]

sedative (sed′a-tiv)
1. Calming; quieting. 2. A drug that quiets nervous excitement; designated according to the organ or system upon which specific action is exerted; e.g., cardiac, cerebral, nervous, respiratory, spinal. [L. sedativus; see sedation]

SEDC
Abbreviation for spondyloepiphyseal dysplasia congenita.

sedigitate (se-dij′i-tat)
SYN: sexdigitate. [L. sex, six, + digitus, digit]

sediment (sed′i-ment)
1. Insoluble material that tends to sink to the bottom of a liquid, as in hypostasis. SYN: sedimentum. 2. To cause or effect the formation of a s. or deposit, as in the case of centrifugation or ultracentrifugation. SYN: sedimentate. [L. sedimentum, a settling, fr. sedeo, to sit, settle down]

sedimentate (sed′i-men-tat)
SYN: sediment (2) .

sedimentation (sed′i-men-ta′shun)
Formation of a sediment.

sedimentator (sed′i-men-ta′ter, tor)
A centrifuge.

sedimentometer (sed′i-men-tom′e-ter)
A photographic apparatus for the automatic recording of the blood sedimentation rate. [sediment + G. metron, measure]

sedimentum (sed-i-men′tum)
SYN: sediment (1) . [L.] s. lateritium SYN: brickdust deposit.

sedoheptulose (se-do-hep′tu-los)
A 2-ketoheptulose formed metabolically in the pentose monophosphate pathway as the 7-phosphate by condensation of d-xylulose 5-phosphate and d-ribose 5-phosphate, splitting out d-glyceraldehyde 3-phosphate; the unphosphorylated sugar is found in Sedum (stonecrop). SYN: d-altro-2-heptulose.

sedoxantrone trihydrochloride (se-doks′an-tron tri-hi-dro-klor-id)
A topoisomerase II inhibitor in cancer chemotherapy.

seed (sed)
1. The reproductive body of a flowering plant; the mature ovule. SYN: semen (2) . 2. In bacteriology, to inoculate a culture medium with microorganisms. [A.S. soed]

Seeligmüller
Otto L.G.A., German neurologist, 1837–1912. See S. sign.

Seessel
Albert, U.S. embryologist, 1850–1910. See S. pocket, S. pouch.

segment (seg′ment) [TA]
1. A section; a part of an organ or other structure delimited naturally, artificially, or by invagination from the remainder. SYN: segmentum [TA] . SEE ALSO: metamere. 2. A territory of an organ having independent function, supply, or drainage. 3. To divide and redivide into minute equal parts. [L. segmentum, fr. seco, to cut] A1 s. of anterior cerebral artery precommunicating part of anterior cerebral artery. A2 s. of anterior cerebral artery postcommunicating part of anterior cerebral artery. abnormal ST s. SYN: isoelectric period. anterior s. [TA] a delimited part or section of an organ or other structure that lies in front of or ventral to the other similar parts or sections. See anterior (bronchopulmonary) s. [S III], anterior basal (bronchopulmonary) s. [S VIII], anterior inferior renal s., anterior superior renal s., anterior ocular s.. SYN: segmentum anterius [TA] . anterior basal (bronchopulmonary) s. [S VIII] of the four bronchopulmonary segments of the inferior lobes of the right or left lung that contact the diaphragm, the one lying in front, i.e., nearest the costal cartilages; supplied by the anterior basal segmental bronchi [B VIII] and anterior basal segmental (pulmonary) artery. SYN: segmentum (bronchopulmonale) basale anterius [S VIII]. anterior (bronchopulmonary) s. [S III] [TA] of the three bronchopulmonary segments comprising the upper lobe of the right or left lungs, the one that lies nearest the costal cartilages, supplied by the anterior segmental bronchis [B III] and anterior segmental (pulmonary) artery. SYN: segmentum (bronchopulmonale) anterius S III [TA] . anterior inferior renal s. portion of the kidney exclusively supplied by the anterior inferior segmental (renal) artery. SYN: segmentum renale anterius inferius. anterior ocular s. portion of the eyeball comprised by the cornea, iris, and lens and the associated chambers (anterior and posterior), which are filled with aqueous humor. SYN: segmentum oculare anterius [TA] . anterior superior renal s. [TA] portion of the kidney exclusively supplied by the anterior superior segmental (renal) artery. SYN: segmentum renale anterius superius. apical (bronchopulmonary) s. [S I] of the three bronchopulmonary segments comprising the superior lobe of the right lung, the one extending to the highest level (into the cervical parietal pleura) that is supplied by the apical segmental bronchus [B I] and the apical segmental (pulmonary) artery. SYN: segmentum bronchopulmonale apicale S I. apicoposterior (bronchopulmonary) s. [SI + SII] of the four bronchopulmonary segments typically comprising the superior lobe of the left lung, the most superior and posterior, supplied by the left apicoposterior segmental bronchus [B I + II]; they correspond approximately in position to the separate apical and posterior bronchopulmonary segments of the superior lobe of the right lung. SYN: segmentum (bronchopulmonale) apicoposterius [SI + II]. arterial segments of kidney SYN: renal segments. segmentum bronchopulmonale basale posterius S X [TA] SYN: posterior basal bronchopulmonary s. S X. bronchopulmonary s. [TA] smallest surgically resectable subdivision of the lobes of the lungs, supplied exclusively by a tertiary (segmental) bronchus and the corresponding tertiary branch of the pulmonary artery (segmental pulmonary artery); typically, the right lung has ten bronchopulmonary segments, and the left has eight or nine due to a merging of the apical and posterior segments of the upper lobe and of the anterior and medial basal segments of the lower lobe. SYN: segmentum bronchopulmonale [TA] . cardiac s. SYN: medial basal bronchopulmonary s. S VII. cervical segments of spinal cord [C1–C8] cervical part of spinal cord. coccygeal s. of spinal cord [Co] inferiormost s. of spinal cord that gives rise to the coccygeal pair of spinal nerves and constitutes the coccygeal part of the spinal cord. SYN: segmentum medullae spinalis coccygeum [Co] [TA] . hepatic segments [TA] surgically resectable portions of the liver supplied by independent branches of the portal vein and hepatic artery, and drained by independent lobular branches of the hepatic bile ducts; thus, the naming and numbering of the eight hepatic segments in TA is based on the portobilioarterial distribution: posterior [I], lateral [II], left lateral anterior [III], and medial [IV] segments of the left (part of) liver, and anterior medial [V], right anterior lateral [VI], posterior lateral [VII], and posterior medial [VIII] segments of the right (part of) liver; the hepatic segments are separated by the vertical planes of the three major (right, intermediate, and left) hepatic veins; those of the right (part of) liver are also separated by the horizontal plane of the right division of the portobilioarterial tree. See anterior s., lateral s., medial s., posterior s.. SYN: segmenta hepatis [TA] , segments of liver. s. I posterior hepatic s. I. inferior s. [TA] a delimited part or section of an organ or other structure that lies at the lowest level (nearest the feet) compared with the other similar parts or sections. SYN: segmentum inferius [TA] . inferior lingular (bronchopulmonary) s. [S V] of the four bronchopulmonary segments that typically comprise the superior lobe of the left lung, the most inferior, supplied by the inferior lingular bronchus [B V] and inferior lingular segmental (pulmonary) artery; corresponds approximately in position to the medial [S V] s. of the middle lobe of the right lung; the lingula is a feature of this part of the left lung. SYN: segmentum lingulare bronchopulmonale inferius S V [TA] . inferior renal s. portion of the kidney exclusively supplied by the inferior segmental (renal) artery. SYN: segmentum renale inferius [TA] . interannular s. SYN: internodal s.. intermaxillary s. the primordial mass of tissue formed by the merging of the medial nasal prominences of the embryo; it contributes to the intermaxillary portion of the upper jaw, the prolabial portion of the upper lip, and the primary palate. internodal s. the portion of a myelinated nerve fiber between two successive nodes. SYN: interannular s., internode, Ranvier s., segmentum internodale. Lanterman segments the divisions of the nerve fiber between the Schmidt-Lanterman incisures. lateral s. [TA] a delimited part or section of an organ or other structure that lies farthest to the left or right compared with the other similar parts or sections. See lateral bronchopulmonary s. S IV, lateral basal (bronchopulmonary) s. [S IX], (left anterior) lateral hepatic s. [III], (left posterior) lateral hepatic s. III, right anterior lateral hepatic s. [VI], (right) posterior lateral hepatic s. [VII]. SYN: segmentum laterale [TA] . lateral basal (bronchopulmonary) s. [S IX] of the four bronchopulmonary segments of the inferior lobes of the right or left lung that contact the diaphragm, the one lying farthest to the right in the right lung, and farthest to the left in the left lung, supplied by the lateral basal segmental bronchi [B IX] and lateral basal segmental (pulmonary) artery. SYN: segmentum (bronchopulmonale) basale laterale [S IX]. lateral bronchopulmonary s. S IV [TA] of the two bronchopulmonary segments comprising the middle lobe of the right lung, the one placed on the right side that is supplied by the lateral segmental bronchus [B IV] and the lateral segmental (pulmonary) artery. SYN: segmentum bronchopulmonale laterale S IV [TA] . (left anterior) lateral hepatic s. [III] [TA] one of the three hepatic segments that constitute the left (part of) liver, the one which lies to the left of the inferior portion of the falciform ligament, typically overlapping the stomach anteriorly, supplied by the lower lateral branch from the umbilical part of the left branch of the hepatic portal vein. SYN: lateral inferior hepatic area [TA] , segmentum hepatis anterius laterale sinistrum [III] [TA] , segmentum III&star. (left) medial hepatic s. [IV] [TA] of the three hepatic segments that constitute the left (part of) liver, the one that lies to the right of the falciform ligament; it lies between that ligament and the vertical plane of the right hepatic vein, that is demarcated on the diaphragmatic surface of the liver by a line extrapolated from the fossa for the gallbladder to the inferior vena cava; the quadrate lobe of the visceral surface of the liver is also part of the medial hepatic s.; the medial s. is supplied by medial branches of the umbilical part of the left branch of the portal vein. SYN: segmentum hepatis mediale (sinistrum) [IV] [TA] , segmentum IV&star. (left posterior) lateral hepatic s. III [TA] of the three hepatic segments that constitute the left (part of) liver, the one that lies to the left of the superior portion of the falciform ligament and the fissure for the ligamentum venosum; typically, it lies superior to the stomach and is supplied by the upper lateral branch from the umbilical part of the left branch of the hepatic portal vein. SYN: lateral superior hepatic area [TA] , segmentum hepatis posterius laterale sinistrum [II] [TA] , segmentum II&star. segments of liver SYN: hepatic segments. lower uterine s. the inferior portion or isthmus of the uterus, the lower extremity of which joins with the cervical canal and, during pregnancy, expands to become the lower part of the uterine cavity. This is not the active contracting portion of the uterus. lumbar segments L1–L5 of spinal cord SYN: lumbar part of spinal cord. lumbar segments of spinal cord L1–5 the five segments of the spinal cord that give rise to the five pairs of lumbar spinal nerves [L1–L5] and constitute the lumbar part of the spinal cord, that in the adult, lies within the portion of the vertebral canal formed by the T11–L1 vertebrae. SYN: segmenta medullae spinalis lumbaria L1–L5. medial s. [TA] a delimited part or section of an organ or other structure that lies closest to the midline compared with the other similar parts or sections. See medial bronchopulmonary s. S V, medial basal bronchopulmonary s. S VII, (left) medial hepatic s. [IV], (right) posterior medial hepatic s. [VIII], (right) anterior medial hepatic s. [V]. SYN: segmentum mediale [TA] . medial basal bronchopulmonary s. S VII [TA] of the four bronchopulmonary segments of the inferior lobes of the right or left lung that contact the diaphragm, the one lying directly inferior to the hilum of the lung in contact with the middle of the lateral aspect of the mediastinum, supplied by the medial basal segmental bronchis [B VII] and medial basal segmental (pulmonary) artery. SYN: segmentum bronchopulmonale basale mediale S VII [TA] , cardiac s., segmentum cardiacum. medial bronchopulmonary s. S V [TA] of the two bronchopulmonary segments comprising the middle lobe of the right lung, the one placed on the left that is supplied by the medial segmental bronchus [B V] and the medial segmental (pulmonary artery). SYN: segmentum bronchopulmonale mediale S V [TA] . mesoblastic s. SYN: somite. M2 s. of middle cerebral artery terminal branches of middle cerebral artery, under branch. neural s. SYN: neuromere. posterior s. [TA] a delimited part or section of an organ or other structure that lies in back of or dorsal to the other similar parts or sections. See posterior bronchopulmonary s. S II, posterior basal bronchopulmonary s. S X, posterior hepatic s. I, (right) posterior lateral hepatic s. [VII], (right) posterior medial hepatic s. [VIII], posterior renal s.. SYN: segmentum posterius [TA] . posterior basal bronchopulmonary s. S X [TA] of the four bronchopulmonary segments of the inferior lobes of the right or left lung that contact the diaphragm, the one lying nearest the vertebral column, supplied by the posterior basal segmental bronchus [B X] and posterior basal segmental (pulmonary) artery. SYN: segmentum bronchopulmonale basale posterius S X [TA] . posterior bronchopulmonary s. S II [TA] of the three bronchopulmonary segments comprising the upper lobe of the right lungs, the one that lies nearest the vertebral column, supplied by the posterior segmental bronchus [B II] and posterior segmental (pulmonary) artery. SYN: segmentum bronchopulmonale posterius S II [TA] . posterior hepatic s. I [TA] the relatively small part of the liver supplied by caudate branches of the left (or left and right) branches of the portal vein, demarcated on the visceral surface of the liver as the caudate lobe. SYN: segmentum hepatis posterius I [TA] , caudate lobe&star, lobus caudatus&star, posterior liver&star, posterior part of liver&star, s. I&star, segmentum I&star, Spigelius lobe. posterior renal s. [TA] part of the kidney exclusively supplied by the posterior segmental (renal) artery. SYN: segmentum renale posterius [TA] . P1 s. of posterior cerebral artery SYN: precommunicating part of posterior cerebral artery. P2 s. of posterior cerebral artery postcommunicating part of posterior cerebral artery. P3 s. of posterior cerebral artery [TA] SYN: lateral occipital artery. P4 s. of posterior cerebral artery medial occipital artery. PR s. that part of the electrocardiographic curve between the end of the P wave and the beginning of the QRS complex. precommunical s. of anterior cerebral artery SYN: precommunicating part of anterior cerebral artery. precommunical s. of posterior cerebral artery SYN: precommunicating part of posterior cerebral artery. Ranvier s. SYN: internodal s.. renal segments [TA] regions of the kidney supplied by end arteries branching from the renal arteries; they are named anterior inferior s., anterior superior s., inferior s., posterior s., and superior s.. SYN: segmenta renalia [TA] , arterial segments of kidney. right anterior lateral hepatic s. [VI] [TA] of the four segments comprising the right (part of) liver (i.e., that lie to the right side of the plane of the middle hepatic vein), the one that also lies to the right of the plane of the right hepatic vein and inferior to the plane of the transverse portion of the right branch of the hepatic portal vein; it is supplied by the lateral anterior branch of the portal vein. SYN: segmentum hepatis anterius laterale dextrum [VI] [TA] . (right) anterior medial hepatic s. [V] [TA] of the four segments comprising the right (part of) liver (i.e., that lie to the right side of the plane of the middle hepatic vein), the one that lies between that plane and the plane of the right hepatic vein and inferior to the plane of the transverse portion of the right branch of the hepatic portal vein; it is supplied by the medial anterior branch of the portal vein. SYN: segmentum hepatis anterius mediale (dextrum) [V] [TA] . (right) posterior lateral hepatic s. [VII] [TA] of the four segments comprising the right (part of) liver (i.e., that lie to the right side of the plane of the middle hepatic vein), the one that also lies to the right of the plane of the right hepatic vein and superior to the plane of the transverse portion of the right branch of the hepatic portal vein; it is supplied by the lateral posterior branch of the portal vein. SYN: segmentum hepatis posterius laterale (dextrum) [VII] [TA] . (right) posterior medial hepatic s. [VIII] [TA] of the four segments comprising the right (part of) liver (i.e., that lie to the right side of the plane of the middle hepatic vein), the one that lies between that plane and the plane of the right hepatic vein and superior to the plane of the transverse portion of the right branch of the hepatic portal vein; it is supplied by the medial posterior branch of the portal vein. SYN: segmentum hepatis posterius mediale (dextrum) [VIII] [TA] . RST s. the part of the electrocardiogram between the QRS complex and the T wave. Virtually never distinct in normal hearts in which it forms the initial limb of the T wave without an agreed endpoint. SYN: ST s.. segments of spinal cord [C1–Co] [TA] one of the 31 portions of the spinal cord, each of which gives rise to the anterior and posterior roots that combine to form a single pair of spinal nerves. These are the cervical spinal cord segments [C1–C8]; the thoracic spinal cord segments [T1–T12]; the lumbar spinal cord segments [L1–L5]; the sacral spinal cord segments [S1–S5], and the coccygeal spinal cord s. [Co]. SYN: segmenta medullae spinalis C1–Co [TA] . segments of spleen splenic territories receiving independent arterial supply or drained by independent roots of the splenic vein. SYN: segmenta lienis. ST s. SYN: RST s.. subapical s. an inconstant s. of the inferior lobe of the right and left lungs. SYN: segmentum subapicale, segmentum subsuperius, subsuperior s.. subsuperior s. SYN: subapical s.. superior s. the uppermost s. of the kidney; superior lingular bronchopulmonary s. S IV [TA] of the four bronchopulmonary segments that typically comprise the superior lobe of the left lung, the s. that lies centrally and posteriorly, supplied by the superior lingular bronchus [B IV] and superior lingular segmental (pulmonary) artery; corresponds approximately in position to the lateral [S IV] s. of the middle lobe of the right lung. SYN: segmentum bronchopulmonale lingulare superius[S IV] [TA] . superior renal s. [TA] portion of the kidney exclusively supplied by the superior segmental (renal) artery. SYN: segmentum renale superius [TA] . sympathetic s. a divison of the sympathetic trunks based on the origins of the gray communicating branches. upper uterine s. the main portion of the body of the gravid uterus, the contraction of which furnishes the chief force of expulsion in labor. venous segments of the kidney anatomic segments of the kidney drained by tributaries of the renal vein; not a true segmental distribution, since cross communication exists between the various tributaries within the kidney.

segmenta (seg-men′ta)
Plural of segmentum.




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