| LAS | laboratory automation system; lateral amyotrophic sclerosis; laxative abuse syndrome; left anterior-... |
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| LASH | left anterior superior hemiblock |
| LATu | lobulo-alveolar tumor |
| LSR | lanthanide shift reagent; lecithin/ sphingomyelin ratio; left superior rectus [muscle]; liver/spleen... |
| LSVC | left superior vena cava |
| vena thyroidea superior | <anatomy, vein> Receives blood from the upper part of the thyroid gland and larynx, accompanies the artery of the same name, and empties into the internal jugular vein. Synonym: vena thyroidea superior. (05 Mar 2000) |
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| vena vermis superior | A vein draining part of the superior part of the cerebellum; it runs on the superior surface of the vermis to terminate in the internal cerebral vein. Synonym: vena vermis superior. (05 Mar 2000) |
| venter superior musculi omohyoidei | <anatomy> The superior belly of the omohyoid muscle, attached to the hyoid bone. Synonym: venter superior musculi omohyoidei. (05 Mar 2000) |
| venula macularis superior | A small tributary of the central vein of the retina that drains the upper part of the macula. Synonym: venula macularis superior. (05 Mar 2000) |
| venula nasalis retinae superior | The small vein that drains blood from the upper medial (nasal) part of the retina; it joins the central vein. Synonym: venula nasalis retinae superior. (05 Mar 2000) |
| venula temporalis retinae superior | The venule that passes from the upper lateral (temporal) part of the retina to join the central vein. Synonym: venula temporalis retinae superior. (05 Mar 2000) |
| margo superior cerebri | The curved margin of the cerebral hemisphere at the junction of the superolateral and medial surfaces. Synonym: margo superomedialis, superomedial margin. (05 Mar 2000) |
| margo superior glandulae suprarenalis | The border of the suprarenal gland at the superior junction of the anterior and posterior surfaces. Synonym: margo superior glandulae suprarenalis. (05 Mar 2000) |
| margo superior pancreatis | The uppermost border of the body of the pancreas that separates the anterior and posterior surfaces. Synonym: margo superior pancreatis. (05 Mar 2000) |
| margo superior partis petrosae ossis temporalis | The margin that separates the anterior and posterior surfaces of the petrous part of the temporal bone and the lateral part of the middle cranial fossa from the posterior cranial fossa. Synonym: margo superior partis petrosae ossis temporalis, crest of petrous part of temporal bone. (05 Mar 2000) |
| margo superior scapulae | The margin of the scapula that extends from the glenoid fossa to the superior angle. Synonym: margo superior scapulae. (05 Mar 2000) |
| margo superior splenis | The notched border of the spleen that separates the gastric and disphragmatic surfaces. Synonym: margo superior splenis. (05 Mar 2000) |
| recessus duodenalis superior | A peritoneal recess extending upward behind the superior duodenal fold. Synonym: recessus duodenalis superior, duodenojejunal fossa, duodenojejunal recess, Jonnesco's fossa, superior duodenal fossa. (05 Mar 2000) |
| recessus ileocaecalis superior | A shallow pouch occasionally existing between the terminal ileum, the caecum, and the ileocolic artery when the latter is present. Synonym: recessus ileocaecalis superior. (05 Mar 2000) |
| recessus membranae tympani superior | A space in the mucous membrane on the inner surface of the tympanic membrane between the flaccid part of the membrane and the neck of the malleus. Synonym: recessus membranae tympani superior, Prussak's pouch, Prussak's space. (05 Mar 2000) |