| LAS | laboratory automation system; lateral amyotrophic sclerosis; laxative abuse syndrome; left anterior-... |
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| LASH | left anterior superior hemiblock |
| LSR | lanthanide shift reagent; lecithin/ sphingomyelin ratio; left superior rectus [muscle]; liver/spleen... |
| LSVC | left superior vena cava |
| MSO | management service organization; medial superior olive; medical staff organization |
| arcus palpebralis superior | Formed by communicating branches of the medial and lateral palpebral arteries. Often two arches are present, one located near the free border of the tarsal plate, the other along the upper border of the tarsus. Synonym: arcus palpebralis superior. (05 Mar 2000) |
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| area vestibularis superior | The area in the fundus of the internal acoustic meatus superior to the transverse crest through which the superior part of the vestibular nerve passes to reach the macula utriculus and the ampullae of the anterior and lateral saemicircular ducts. Synonym: area vestibularis superior. (05 Mar 2000) |
| arteria alveolaris superior posterior | <anatomy, artery> Origin, 3rd part of maxillary artery within pterygopalatine fossa; distribution, molar and premolar teeth, gingiva and mucous membrane of maxillary sinus. Synonym: arteria alveolaris superior posterior, posterior alveolar artery, posterior dental artery. (05 Mar 2000) |
| arteria cerebelli superior | <anatomy, artery> Origin, basilar; distribution, upper surface of cerebellum, colliculi, and most of the cerebellar nuclei; anastomoses, posterior inferior cerebellar. Synonym: arteria cerebelli superior. (05 Mar 2000) |
| arteria collateralis ulnaris superior | <anatomy, artery> Origin, brachial; distribution, elbow joint; anastomoses, posterior ulnar recurrent and inferior ulnar collateral, as part of the articular vascular network of the elbow. Synonym: arteria collateralis ulnaris superior. (05 Mar 2000) |
| arteria epigastrica superior | <anatomy, artery> Origin, the medial terminal branch of internal thoracic; distribution, abdominal muscles and integument, falciform ligament; anastomoses, inferior epigastric. Synonym: arteria epigastrica superior. (05 Mar 2000) |
| arteria genus superior lateralis | <anatomy, artery> Origin, popliteal; distribution, knee joint; anastomoses, lateral circumflex femoral, third perforating, anterior tibial recurrent, lateral inferior genicular, i.e., the articular vascular network of the knee. Synonym: arteria genus superior lateralis, lateral superior genicular artery. (05 Mar 2000) |
| arteria genus superior medialis | <anatomy, artery> Origin, popliteal; distribution, knee joint; anastomoses, descending genicular, lateral superior genicular, i.e., the articular vascular network of the knee. Synonym: arteria genus superior medialis, medial superior genicular artery. (05 Mar 2000) |
| arteria glutea superior | <anatomy, artery> Origin, internal iliac; distribution, gluteal region; anastomoses, lateral sacral, inferior gluteal, internal pudendal, deep circumflex iliac, lateral circumflex femoral. Synonym: arteria glutea superior. (05 Mar 2000) |
| arteria hypophysialis superior | <anatomy, artery> A small branch of the cerebral part of the internal carotid artery supplying the hypophysis. Synonym: arteria hypophysialis superior. (05 Mar 2000) |
| arteria labialis superior | <anatomy, artery> Origin, facial; distribution, structures of upper lip and, by a septal branch, the anterior and lower part of the nasal septum; anastomoses, the artery of the opposite side and the sphenopalatine. Synonym: arteria labialis superior. (05 Mar 2000) |
| arteria laryngea superior | <anatomy, artery> Origin, superior thyroid; distribution, muscles and mucous membrane of larynx; anastomoses, cricothyroid branch of superior thyroid and terminal branches of inferior laryngeal. Synonym: arteria laryngea superior. (05 Mar 2000) |
| arteria mesenterica superior | <anatomy, artery> Origin, abdominal aorta; branches, inferior pancreaticoduodenal, jejunal, ileal, ileocolic, appendicular, right colic, middle colic; anastomoses, superior pancreaticoduodenal and left colic. Synonym: arteria mesenterica superior. (05 Mar 2000) |
| arteria pancreaticoduodenalis superior | <anatomy, artery> Origin, gastroduodenal; one of two arteries, anterior and superior; distribution, head of pancreas, duodenum, common bile duct; anastomoses, inferior pancreaticoduodenal, splenic. Synonym: arteria pancreaticoduodenalis superior. (05 Mar 2000) |
| arteria phrenica superior | <anatomy, artery> One of a pair of small arteries given off from the thoracic aorta just superior to the diaphragm; distribution, diaphragm; anastomoses, musculophrenic, pericardiacophrenic, and inferior phrenic. Synonym: arteria phrenica superior. (05 Mar 2000) |