| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |
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| ISM | information sources map [of UMLS]; International Society of Microbiologists; intersegmental muscle |
| LDM | lactate dehydrogenase, muscle; limited dorsal myeloschisis |
| LLD | left lateral decubitus [muscle]; leg length discrepancy; long-lasting depolarization |
| LLR | large local reaction; left lateral rectus [muscle]; left lumbar region |
| superior longitudinal fasciculus | Long association fibre bundle lateral to the centrum ovale of the cerebral hemisphere, connecting the frontal, occipital, and temporal lobes; the fibres pass from the frontal lobe through the operculum to the posterior end of the lateral sulcus where many fibres radiate into the occipital lobe and others turn downward and forward around the putamen and pass to anterior portions of the temporal lobe. Synonym: fasciculus longitudinalis superior, arcuate fasciculus. (05 Mar 2000) |
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| superior longitudinal sinus | An unpaired dural venous sinus in the sagittal groove, beginning at the foramen caecum and terminating at the confluence of sinuses where it merges with the straight sinus; receives the superior cerebral veins and has lateral extensions, the lateral venous lacunae. Synonym: sinus sagittalis superior, superior longitudinal sinus. Tarsal sinus, a hollow or canal formed by the groove of the talus and the interosseous groove of the calcaneus which is occupied by the interosseous talocalcaneal ligament. Synonym: sinus tarsi, tarsal canal. (05 Mar 2000) |
| superior longitudinal sulcus | 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) |
| superior macular arteriole | Origin, central artery of retina; distribution, upper part of macula. Synonym: arteriola macularis superior. (05 Mar 2000) |
| superior macular venule | 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) |
| superior maxillary nerve | <anatomy, nerve> The intermediate sensory division of the trigeminal (5th cranial) nerve. The maxillary nerve carries general afferents from the intermediate region of the face including the lower eyelid, nose and upper lip, the maxillary teeth, and parts of the dura. (12 Dec 1998) |
| superior medial genicular artery | <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) |
| superior mediastinum | That part lying above, i.e., above the pericardium; it contains the arch of the aorta and the vessels arising from it, the brachiocephalic veins, and upper portion of the superior vena cava, the trachea, the oesophagus, the thoracic duct, the thymus, and the phrenic, vagus, cardiac, and left recurrent laryngeal nerves. Synonym: mediastinum superius. (05 Mar 2000) |
| superior medullary velum | The thin layer of white matter stretching between the two superior cerebellar peduncles, forming the roof of the superior recess of the fourth ventricle. Synonym: velum medullare superius, anterior medullary velum, Vieussens' valve. (05 Mar 2000) |
| superior mesenteric artery | <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) |
| superior mesenteric artery syndrome | <radiology> Partial obstruction of third part of duodenum by superior mesenteric artery seen with: marked weight loss, anorexia nervosa, total body casting X-ray: distension of proximal duodenum, classically disappears when prone (12 Dec 1998) |
| superior mesenteric ganglion | A paired sympathetic ganglion located at the origin of the superior mesenteric artery from the aorta. Synonym: ganglion mesentericum superius. (05 Mar 2000) |
| superior mesenteric lymph nodes | The numerous nodes located in the mesentery along the superior mesenteric artery; they receive lymph from the central mesenteric lymph nodes and drain into the intestinal lymph trunk. Synonym: nodi lymphatici mesenterici superiores, nodi lymphatici centrales. (05 Mar 2000) |
| superior mesenteric plexus | An autonomic plexus, a continuation of the abdominal aortic plexus, sending nerves to the intestines and forming with the vagus the subserous, myenteric, and submucous plexus's; this periarterial plexus is so dense that it results in the appearance of a characteristic perivascular "collar" distinguishing the superior mesenteric artery from the superior mesenteric vein in several imaging modalities such as with ultra sound. Synonym: plexus mesentericus superior. (05 Mar 2000) |
| superior mesenteric vein | <anatomy, vein> Begins at the ileum in the right iliac fossa, ascends in the root of the mesentery, and unites behind the pancreas with the splenic vein to form the hepatic portal vein. Synonym: vena mesenterica superior. (05 Mar 2000) |