| IR | drop of voltage across a resistor produced by a current; ileal resection; immune response; immunizat... |
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| IRV | inferior radicular vein; inspiratory reserve volume; inverse ratio ventilation |
| ITA | inferior temporal artery; internal thoracic artery; International Tuberculosis Association |
| ITQ | inferior temporal quadrant |
| ITV | inferior temporal vein |
| arcus dentalis inferior | The teeth supported by the alveolar part of the mandible, whether the 10 deciduous teeth or the 16 permanent teeth. Synonym: arcus dentalis inferior, mandibular dentition. (05 Mar 2000) |
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| arcus palpebralis inferior | Formed by the medial palpebral artery which communicates with a branch of the lacrimal artery along the tarsal margin. Synonym: arcus palpebralis inferior. (05 Mar 2000) |
| area vestibularis inferior | The area of the fundus of the internal acoustic meatus inferior to the transverse crest through which the interior portion of the vestibular (saccular) nerve passes. Synonym: area vestibularis inferior. (05 Mar 2000) |
| arteria alveolaris inferior | <anatomy, artery> Origin, 1st part of maxillary artery; distribution, through mandibular foramen/canal to lower teeth and chin; branches, artery to mylohyoid, mental artery, dental arteries. Synonym: arteria alveolaris inferior, inferior dental artery. (05 Mar 2000) |
| arteria cerebelli inferior anterior | <anatomy, artery> Origin, basilar; distribution, lower surface of lateral lobes of cerebellum, choroid plexus in cerebellopontine angle; anastomoses, posterior inferior cerebellar; usual source of labyrinthine artery. Synonym: arteria cerebelli inferior anterior. (05 Mar 2000) |
| arteria cerebelli inferior posterior | <anatomy, artery> Origin, vertebral; distribution, lateral medulla, choroid plexus of fourth ventricle, and cerebellum; anastomoses, superior cerebellar and anterior inferior cerebellar. Synonym: arteria cerebelli inferior posterior. (05 Mar 2000) |
| arteria collateralis ulnaris inferior | <anatomy, artery> Origin, brachial; distribution, arm muscles at back of elbow; anastomoses, anterior and posterior ulnar recurrent, superior ulnar collateral, profunda brachii, and recurrent interosseous, as part of the articular network of the elbow. Synonym: arteria collateralis ulnaris inferior, arteria anastomotica magna, great anastomotic artery. (05 Mar 2000) |
| arteria epigastrica inferior | <anatomy, artery> Origin, external iliac; branches, cremasteric, muscular and pubic; anastomoses, superior epigastric, obturator. With overlying peritoneum, forms lateral umbilical ligament and forms a basis for distinguishing types of inguinal herniae: direct hernias pass medial to the artery; indirect hernias pass laterally. Synonym: arteria epigastrica inferior, deep epigastric artery. (05 Mar 2000) |
| arteria genus inferior lateralis | <anatomy, artery> Origin, popliteal; distribution, knee joint; anastomoses, lateral superior genicular and anterior tibial recurrent (and posterior); i.e., articular vascular network of knee. Synonym: arteria genus inferior lateralis, lateral inferior genicular artery. (05 Mar 2000) |
| arteria genus inferior medialis | <anatomy, artery> Origin, popliteal; distribution, knee joint; anastomoses, anterior and posterior tibial recurrent and medial superior genicular, i.e., articular vascular network of knee. Synonym: arteria genus inferior medialis, medial inferior genicular artery. (05 Mar 2000) |
| arteria glutea inferior | <anatomy, artery> Origin, internal iliac; distribution, hip joint and gluteal region; anastomoses, branches of internal pudendal, lateral sacral, superior gluteal, obturator, medial and lateral circumflex femoral. Synonym: arteria glutea inferior, arteria ischiadica, arteria ischiatica. (05 Mar 2000) |
| arteria hypophysialis inferior | <anatomy, artery> A small branch of the cavernous part of the internal carotid to the hypophysis. Synonym: arteria hypophysialis inferior. (05 Mar 2000) |
| arteria labialis inferior | <anatomy, artery> Origin, facial; distribution, structures of lower lip; anastomoses, the artery from the opposite side, mental and sublabial. Synonym: arteria labialis inferior. (05 Mar 2000) |
| arteria laryngea inferior | <anatomy, artery> Origin, inferior thyroid; distribution, muscles and mucous membrane of larynx; anastomoses, superior laryngeal. Synonym: arteria laryngea inferior. (05 Mar 2000) |
| arteria mesenterica inferior | <anatomy, artery> Origin, abdominal aorta; branches, left colic, sigmoid, superior rectal; anastomoses, middle colic and middle rectal. Synonym: arteria mesenterica inferior. (05 Mar 2000) |