| 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 |
| venter inferior musculi omohyoidei | <anatomy> The inferior belly of the omohyoid muscle, attached to the superior border of the scapula. Synonym: venter inferior musculi omohyoidei. (05 Mar 2000) |
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| margo inferior | The caudal or lowermost margin of a structure. Synonym: inferior margin, margo inferior. (05 Mar 2000) |
| margo inferior cerebri | The irregular, discontinuous margin of the cerebral hemisphere at the junction of the inferior and superolateral surfaces. Synonym: margo inferolateralis, inferolateral margin. (05 Mar 2000) |
| margo inferior hepatis | The sharp border of the liver that separates the diaphragmatic and visceral surfaces. Synonym: margo inferior hepatis. (05 Mar 2000) |
| margo inferior pancreatis | The border of the pancreas separating the inferior and posterior surfaces. Synonym: margo inferior pancreatis, margo inferior splenis. (05 Mar 2000) |
| margo inferior pulmonis | The sharp border of the lung that separates the diaphragmatic surface from the costal and mediastinal surfaces. Synonym: margo inferior pulmonis. (05 Mar 2000) |
| margo inferior splenis | The border of the pancreas separating the inferior and posterior surfaces. Synonym: margo inferior pancreatis, margo inferior splenis. (05 Mar 2000) |
| venula macularis inferior | A small tributary of the central vein of the retina that drains the lower part of the macula. Synonym: venula macularis inferior. (05 Mar 2000) |
| venula nasalis retinae inferior | The small vein that passes from the inferior medial (nasal) part of the retina to join the central vein. Synonym: venula nasalis retinae inferior. (05 Mar 2000) |
| venula temporalis retinae inferior | The small vein that passes from the lower lateral (temporal) part of the retina to enter the central vein. Synonym: venula temporalis retinae inferior. (05 Mar 2000) |
| recessus duodenalis inferior | The variable peritoneal recess which lies behind the inferior duodenal fold and along the ascending part of the duodenum. Synonym: recessus duodenalis inferior, Gruber-Landzert fossa, inferior duodenal fossa. (05 Mar 2000) |
| recessus ileocaecalis inferior | A deep fossa sometimes found between the ileocaecal fold, the mesoappendix, and the caecum. Synonym: recessus ileocaecalis inferior. (05 Mar 2000) |
| recessus inferior omentalis | A recess of the omental bursa extending between anterior and posterior layers of the great omentum. Synonym: recessus inferior omentalis. (05 Mar 2000) |
| paries inferior orbitae | The floor of the orbit; the shortest of the four walls of the orbit, sloping upward from the orbital margin; it is comprised of the maxilla and orbital process of the palatine bone. Synonym: paries inferior orbitae, inferior wall of orbit. (05 Mar 2000) |
| pars inferior | The lowermost portion of a structure relative to the other parts; portion closest to the soles of the feet. See: inferior part of duodenum, inferior part of lingular branch of left pulmonary vein, inferior part of vestibular ganglion. Synonym: pars inferior. (05 Mar 2000) |