| SMAS | submuscular aponeurotic system; superficial musculo-aponeurotic system; superior mesenteric artery s... |
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| SMV | superior mesenteric vein |
| SO | salpingo-oophorectomy; Schlatter-Osgood [test]; second opinion; sex offender; spheno-occipital [sync... |
| SOF | superior orbital fissure |
| SOM | secretory otitis media; sensitivity of method; serous otitis media; somatotropin; state operations m... |
| mesenteric artery, superior | A large vessel supplying the whole length of the small intestine except the superior part of the duodenum. It also supplies the caecum and the ascending part of the colon and about half the transverse part of the colon. It arises from the anterior surface of the aorta below the coeliac artery at the level of the first lumbar vertebra. (12 Dec 1998) |
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| gray layer of superior colliculus | Term applied to any one of the three major layers of gray matter of the superior colliculus that alternate with layers composed chiefly of nerve fibres: 1) the superficial gray layer of superior colliculus, above the largely white layer of the incoming fibres of the optic tract (optic layer); 2) the middle gray layer of superior colliculus, placed between the optic layer and a more deeply located layer of fibres, the stratum lemnisci; 3) the deep gray layer of superior colliculus, between the stratum lemnisci and the central gray substance surrounding the cerebral aqueduct, and containing the large nerve cells from which most of the colliculus descending connections (tectobulbar, tectopontine, and tectospinal tract) originate. Synonym: stratum griseum colliculi superioris, stratum cinereum colliculi superioris. (05 Mar 2000) |
| great superior pancreatic artery | <anatomy, artery> Origin, splenic; distribution, head and body of pancreas; anastomoses, superior pancreaticoduodenal. Synonym: arteria pancreatica dorsalis, great superior pancreatic artery. (05 Mar 2000) |
| right superior intercostal vein | <anatomy, vein> A tributary of the azygos vein formed by the union of the right second, third, and fourth posterior intercostal veins. Synonym: vena intercostalis superior dextra. (05 Mar 2000) |
| right superior pulmonary vein | <anatomy, vein> The vein returning oxygenated blood from the superior and middle lobes of the right lung to the left atrium. Synonym: vena pulmonalis superior dextra. (05 Mar 2000) |
| groove for superior petrosal sinus | A groove on the crest of the petrous portion of the temporal bone in which rests the superior petrosal sinus. Synonym: sulcus sinus petrosi superioris, superior petrosal sulcus. (05 Mar 2000) |
| groove for superior sagittal sinus | The groove in the midline of the inner table of the calvaria lodging the superior sagittal sinus. Synonym: sulcus sinus sagittalis superioris, sagittal groove, sagittal sulcus, superior longitudinal sulcus. (05 Mar 2000) |
| groove for superior vena cava | A groove on the surface of the right lung, above the hilum, in which runs the superior vena cava. Synonym: sulcus venae cavae cranialis. (05 Mar 2000) |
| gyrus frontalis superior | A broad convolution running in an anteroposterior direction on the medial edge of the convex surface and of each frontal lobe. Synonym: gyrus frontalis superior, marginal gyrus, superior frontal convolution. (05 Mar 2000) |
| gyrus temporalis superior | A longitudinal gyrus on the lateral surface of the temporal lobe between the lateral (sylvian) fissure and the superior temporal sulcus. Synonym: gyrus temporalis superior, first temporal convolution, superior temporal convolution. (05 Mar 2000) |
| middle gray layer of superior colliculus | See: gray layer of superior colliculus. Molecular layer, term applied to any layer of brain tissue that contains few nerve-cell bodies and is composed largely of terminal arborizations of dendrites and axons; notable examples are the superficial layer (first layer) of the cerebral cortex and the molecular layer of cerebellum. Synonym: plexiform layer, stratum moleculare. (05 Mar 2000) |
| middle superior alveolar branch of infraorbital nerve | <anatomy, nerve> The middle superior alveolar branch, a branch of the superior alveolar nerve that contributes to the superior dental plexus. Synonym: ramus alveolaris superior medius nervi infraorbitalis. (05 Mar 2000) |
| colliculus superior | The paired, larger, rounded anterior eminence of the laminae of mesencephalic tectum; major afferent connections of the superficial layers are the retina and striate cortex; input to deep layers of the colliculus are polymodal. Its efferent connections are with the lower brainstem and spinal cord (tectobulbar tract and tectospinal tract) and with the pulvinar and other cell groups in the caudal part of the thalamus; participates in extrageniculate visual pathway. Synonym: colliculus superior, anterior quadrigeminal body, corpus quadrigeminum anterius. (05 Mar 2000) |
| commissure of superior colliculus | Nerve fibres interconnecting corresponding and noncorresponding portions of the two superior colliculi across the midline; may contain fibres originating outside the tectum. (05 Mar 2000) |
| communicating branch of superior laryngeal nerve with recurrent laryngeal nerve | <anatomy, nerve> Branch of internal branch of superior laryngeal nerve communicating with the recurrent laryngeal nerve in the wall of the laryngopharynx supplying sensory fibres to the latter. Synonym: ramus communicans nervi laryngei recurrentis cum ramo laryngeo interno, ramus communicans nervi laryngei superioris cum nervo laryngeo recurrenti, Galen's anastomosis, Galen's nerve. (05 Mar 2000) |