| 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 |
| anterior facial vein | <anatomy, vein> A continuation of the angular vein at the medial angle of the eye. It passes diagonally downward and outward, joining with the retromandibular vein below the border of the lower jaw before emptying into the internal jugular vein. Synonym: anterior facial vein, vena facialis anterior, vena facialis. (05 Mar 2000) |
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| anterior jugular vein | <anatomy, vein> It arises below the chin from veins draining the lower lip and mental region, descends the anterior portion of the neck superficially, and terminates in the external jugular vein at the lateral border of the scalenus anterior muscle. Synonym: vena jugularis anterior. (05 Mar 2000) |
| anterior pontomesencephalic vein | A vein in the midline of the interpeduncular fossa on the superior and anterior aspects of the pons; it communicates with the basal vein superiorly and the petrosal vein inferiorly. Synonym: anterior pontomesencephalic vein. (05 Mar 2000) |
| anterior vein of septum pellucidum | Vein draining the anterior part of the transparent septum; it empties into the superior thalamostriate vein. Synonym: vena septi pellucidi anterior. (05 Mar 2000) |
| anterior vertebral vein | <anatomy, vein> The small vein that accompanies the ascending cervical artery; it opens below into the vertebral vein. Synonym: vena vertebralis anterior. (05 Mar 2000) |
| appendicular vein | <anatomy, vein> The tributary of the ileocolic vein that accompanies the appendicular artery. Synonym: vena appendicularis. (05 Mar 2000) |
| aqueous vein | <anatomy, vein> A tributary of the anterior ciliary vein which receives aqueous humor from the sinus venosus sclerae. (05 Mar 2000) |
| arterial vein | <anatomy, vein> So called because it ramifies like an artery (portal vein) or because, while proceeding from the heart like an artery, it contains unoxygenated blood, like a vein (pulmonary artery). Synonym: vena arteriosa. (05 Mar 2000) |
| ascending lumbar vein | <anatomy, vein> Paired, vertical vein of the posterior abdominal wall, adjacent and parallel to the vertebral column, posterior to the origin of the psoas major muscle; it connects the common iliac, iliolumbar, and lumbar veins in the paravertebral line, the right vein joining the right subcostal vein to form the azygos vein, the left vein uniting with the left subcostal vein to form the hemiazygos vein. Synonym: vena lumbalis ascendens. (05 Mar 2000) |
| axillary vein | <anatomy, vein> The venous trunk of the upper limb; a continuation of the basilar and brachial veins running from the lower border of the teres major muscle to the outer border of the first rib where it becomes the subclavian vein. (12 Dec 1998) |
| azygos vein | <anatomy, vein> A vein which arises from the right ascending lumbar vein or the vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates in the superior vena cava. (12 Dec 1998) |
| azygos vein principle | A principle based on the observation that animals can survive prolonged vena caval occlusion without sequelae: if blood from the azygos vein alone is permitted to enter the heart, patients are perfused during cardiac and pulmonary bypass at flows much less than the normal resting cardiac output. Synonym: low flow principle. (05 Mar 2000) |
| basal vein of Rosenthal | A large vein passing caudally and dorsally along the medial surface of the temporal lobe from which it receives tributaries; it empties into the great cerebral vein (of Galen) from the lateral side. Synonym: vena basalis, Rosenthal's vein. (05 Mar 2000) |
| basilic vein | <anatomy, vein> Arises from the ulnar side of the dorsal venous network of the hand; it curves around the medial side of the forearm, communicates with the cephalic vein via the median cubital vein, and passes up the medial side of the arm to join the axillary vein. Synonym: vena basilica. (05 Mar 2000) |
| basivertebral vein | <anatomy, vein> One of a number of veins in the spongy substance of the bodies of the vertebrae, emptying into the anterior internal vertebral venous plexus. Synonym: vena basivertebralis. (05 Mar 2000) |