| 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 |
| pars infraclavicularis plexus brachialis | The part of the brachial plexus that extends from the level of the clavicle downward into the axilla; it includes the cords of the plexus and their branches. Synonym: pars infraclavicularis plexus brachialis. (05 Mar 2000) |
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| pars supraclavicularis plexus brachialis | The part of the brachial plexus, including the roots, trunks, and divisions, that gives rise to the dorsal scapular, long thoracic, suprascapular and subclavian nerves. Synonym: pars supraclavicularis plexus brachialis. (05 Mar 2000) |
| maxillary plexus | <anatomy, artery> An autonomic plexus on the maxillary artery derived from the external carotid plexus. Synonym: internal maxillary plexus, maxillary plexus, plexus maxillaris internus. (05 Mar 2000) |
| cavernous plexus of clitoris | Nerves corresponding to the cavernous nerves of penis in the male, arising from the vesicular portion of the pelvic plexus. Synonym: nervi cavernosi clitoridis, cavernous plexus of clitoris. (05 Mar 2000) |
| cavernous plexus of conchae | Erectile tissue in the mucous membrane covering the conchae of the nasal cavity. Synonym: plexus cavernosi concharum, corpus cavernosum conchae. (05 Mar 2000) |
| cavernous plexus of penis | Two nerves, major and minor, derived from the prostatic portion of the pelvic plexus supplying sympathetic and parasympathetic fibres to the helicine arteries and arteriorvenous anastomoses of the corpus cavernosum stimulating erection. Synonym: nervi cavernosi penis, cavernous plexus of penis. (05 Mar 2000) |
| medial cord of brachial plexus | In the brachial plexus, the bundle of nerve fibres formed by the anterior division of the inferior trunk which lies medial to the axillary artery; it gives off the medial pectoral nerve, the medial brachial cutaneous, and medial antebrachial cutaneous, nerves and end by dividing into the medial root of the median nerves and the ulnar nerve. Synonym: fasciculus medialis plexus brachialis. (05 Mar 2000) |
| Remak's plexus | A gangliated plexus of unmyelinated nerve fibres, derived chiefly from the superior mesenteric plexus, ramifying in the intestinal submucosa. Synonym: plexus submucosus, Meissner's plexus, Remak's plexus. (05 Mar 2000) |
| renal plexus | The autonomic plexus surrounding the renal artery and extending with it into the substance of the kidney. Synonym: plexus renalis. (05 Mar 2000) |
| pelvic plexus | One of the bilateral autonomic plexus in the pelvis distributed to the pelvic viscera; it receives the hypogastric nerves and the pelvic splanchnic nerves. Synonym: plexus hypogastricus inferior, plexus pelvinus, pelvic plexus. (05 Mar 2000) |
| Meissner's plexus | A gangliated plexus of unmyelinated nerve fibres, derived chiefly from the superior mesenteric plexus, ramifying in the intestinal submucosa. Synonym: plexus submucosus, Meissner's plexus, Remak's plexus. (05 Mar 2000) |
| cervical plexus | A network of nerve fibres originating in the upper four cervical spinal cord segments. The cervical plexus distributes cutaneous nerves to parts of the neck, shoulders, and back of the head, and motor fibres to muscles of the cervical spinal column, infrahyoid muscles, and the diaphragm. (12 Dec 1998) |
| meningeal plexus | A nerve plexus on the cerebral meninges, derived from the external carotid plexus. Synonym: plexus meningeus. (05 Mar 2000) |
| periarterial plexus | An autonomic plexus that accompanies an artery, surrounding it in a network of autonomic nerve fibres. Synonym: plexus periarterialis. (05 Mar 2000) |
| periarterial plexus of maxillary artery | <anatomy, artery> An autonomic plexus on the maxillary artery derived from the external carotid plexus. Synonym: internal maxillary plexus, maxillary plexus, plexus maxillaris internus. (05 Mar 2000) |