| 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 |
| IVC | inferior vena cava; inspiratory vital capacity; integrated vector control; intravascular coagulation... |
| descending branch of occipital artery | <anatomy, artery> Origin: occipital artery within occipital groove; distribution: posterior neck muscles and cervical trapezius muscle; anastomoses: superficial and deep cervical arteries, vertebral artery. Synonym: ramus descendens arteriae occipitalis, princeps cervicis artery, princeps cervicis. (05 Mar 2000) |
|---|---|
| descending posterior branch | The descending posterior branch of the superior lobar branch of the right pulmonary artery. Synonym: ramus posterior descendens. (05 Mar 2000) |
| digastric branch of facial nerve | <anatomy, nerve> Branch of the facial nerve innervating the posterior belly of the digastric muscle. Synonym: ramus digastricus nervi facialis. (05 Mar 2000) |
| dorsal branch | <anatomy, nerve> The smaller, posteriorly-directed major terminal branch (with the ventral primary ramus) of all 31 pairs of mixed spinal nerves, formed at the intervertebral foramen and turning abruptly posteriorly to divide into lateral and medial branches, both of which will supply the deep (true) muscles of the back. The medial branch (rami medialis ) of the dorsal primary ramus also supplies articular branches to the zygopophyseal joints and the periosteum of the vertebral arch. In the neck and upper back, the medial branch continues through the deep and superficial back muscles to supply overlying skin; in the lower back, the lateral branch does this. Nomina Anatomica lists dorsal primary rami as "rami dorsales" for each group of spinal nerves: 1) cervical (nervorum cervicalium ), 2) thoracic (nervorum thoracicorum ), 3) lumbar (nervorum lumbalium ), 4) sacral (nervorum sacralium ), and 5) coccygeal (nervi coccygei ). Synonym: ramus dorsalis nervorum spinalium, ramus dorsalis, rami posteriores nervorum spinalium, dorsal branch, posterior primary division. (05 Mar 2000) |
| dorsal branch of the lumbar artery | <anatomy, artery> Terminal branch (with ventral branch) of the 4-5 lumbar arteries, distributed to lumbar portion of back, posterior vertebral column, and spinal cord and environs. Synonym: ramus dorsalis arteriae lumbalium. (05 Mar 2000) |
| dorsal branch of the posterior intercostal arteries 3-11 | Terminal branch (with ventral branch) of the 3rd through 11th posterior intercostal arteries, distributed to thoracic portion of posterior vertebral column, spinal cord and environs, and back. Synonym: ramus dorsalis arteriarum intercostalium posteriorum III-XI. (05 Mar 2000) |
| dorsal branch of the posterior intercostal veins 4-11 | Major tributary of the 4th through 11th posterior intercostal veins; area drained is the same as that supplied by the dorsal branch of posterior intercostal arteries. Synonym: ramus dorsalis venarum intercostalium posteriorum IV-XI. (05 Mar 2000) |
| dorsal branch of the subcostal artery | <anatomy, artery> Terminal branch (with ventral branch) of subcostal artery, distributed to posterior vertebral column, spinal cord and environs, and back at the T12-L1 vertebral level. Synonym: rami dorsales arteriae subcostalis. (05 Mar 2000) |
| dorsal branch of the superior intercostal artery | <anatomy, artery> Branches of the 1st and 2nd posterior intercostal arteries which arise as branches of the supreme intercostal artery. The distribution is the same as for the dorsal branches of the other posterior intercostal arteries at the T1-T2 vertebral level. Synonym: rami dorsales arteriae intercostalis supremae. (05 Mar 2000) |
| dorsal branch of the ulnar nerve | <anatomy, nerve> Branch arising from the ulnar nerve proximal to the wrist for distribution to the medial side of the dorsum of the hand and proximal portion of the little finger and medial side of ring finger. Synonym: rami dorsales nervi ulnaris. (05 Mar 2000) |
| dorsal carpal branch of radial artery | <anatomy, artery> A branch of the radial artery that passes to the back of the wrist to join the dorsal carpal network. Synonym: ramus carpalis dorsalis arteriae radialis, ramus carpeus dorsalis arteriae radialis. (05 Mar 2000) |
| dorsal carpal branch of ulnar artery | <anatomy, artery> A branch of the ulnar artery that passes to the dorsal side of the carpus to enter the dorsal carpal network. Synonym: ramus carpeus dorsalis arteriae ulnaris, ramus carpalis dorsalis arteriae ulnaris. (05 Mar 2000) |
| iliac branch of iliolumbar artery | <anatomy, artery> Terminal branch of iliolumbar artery (with lumbar branch) distributed to iliac fossa to supply iliac muscle, ilium, and portions of muscles having attachment to the iliac crest. Synonym: ramus iliacus arteriae iliolumbalis. (05 Mar 2000) |
| infrahyoid branch of superior thyroid artery | <anatomy, artery> Small branch from the initial part of the superior thyroid artery coursing along the hyoid bone deep to the thyrohyoid muscle to anastomose with its contralateral partner. Synonym: ramus infrahyoideus arteriae thyroidea superioris. (05 Mar 2000) |
| infralobar part of posterior branch of right pulmonary vein | <anatomy, vein> The vein draining the posterior segment of the right lung that emerges inferior to the superior lobe; tributary to the posterior branch of the right superior pulmonary vein. Synonym: pars infralobaris rami posterioris venae pulmonalis dextrae. (05 Mar 2000) |