| NR | do not repeat [Lat. non repetatur]; nerve root; neural retina; neutral red; noise reduction; nonreac... |
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| NTV | nerve tissue vaccine |
| OMN | oculomotor nerve |
| ON | occipitonuchal; office nurse; onlay; optic nerve; orthopedic nurse; osteonecrosis; osteonectin; over... |
| ONG | optic nerve glioma |
| posterior humeral circumflex artery | <anatomy, artery> Origin, axillary; distribution, muscles and structures of shoulder joint; anastomoses, anterior circumflex humeral, suprascapular, thoracoacromial, and profunda brachii. Synonym: arteria circumflexa humeri posterior, posterior humeral circumflex artery. (05 Mar 2000) |
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| posterior hypothalamic area | Caudal portions of the hypothalamus located internally in the area of the mamillary body, includes medial, intermediate, and lateral mamillary nuclei and the posterior hypothalamic nuclei. Synonym: posterior hypothalamic area. (05 Mar 2000) |
| posterior hypothalamic nucleus | A large, periventricular hypothalamic nucleus located dorsal to the mamillary body, continuous with the central gray substance of the mesencephalon. Synonym: nucleus posterior hypothalami. (05 Mar 2000) |
| posterior hypothalamic region | Caudal portions of the hypothalamus located internally in the area of the mamillary body, includes medial, intermediate, and lateral mamillary nuclei and the posterior hypothalamic nuclei. Synonym: posterior hypothalamic area. (05 Mar 2000) |
| posterior inferior cerebellar artery | <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) |
| posterior inferior cerebellar artery syndrome | <syndrome> A syndrome due usually to thrombosis, characterised by dysarthria, dysphagia, staggering gait, and vertigo, and marked by hypotonia, incoordination of voluntary movement, nystagmus, Horner's syndrome on the ipsilateral side, and loss of pain and temperature senses on the side of the body opposite to the lesion. Synonym: lateral medullary syndrome, Wallenberg's syndrome. (05 Mar 2000) |
| posterior inferior iliac spine | Spine at the inferior end of the posterior border of the ilium between the posterior superior iliac spine and the greater sciatic notch; it forms the upper margin of the latter. Synonym: spina iliaca posterior inferior. (05 Mar 2000) |
| posterior intercondylar area of tibia | The deep notch between the tibial condyles posteriorly to which attaches the posterior cruciate ligament. Synonym: area intercondylaris posterior tibiae. (05 Mar 2000) |
| posterior intercostal arteries | Terminal branches of the superior intercostal artery (from costocervical trunk) supplying upper two intercostal spaces (1-2). Posterior intercostal arteries 3-11, one of nine pairs of arteries arising from the thoracic aorta and distributed to the nine lower intercostal spaces, vertebral column, spinal cord, and muscles and integument of the back; they anastomose with branches of the musculophrenic, internal thoracic, superior epigastric, subcostal and lumbar. Synonym: arteriae intercostales posteriores. (05 Mar 2000) |
| posterior intercostal veins | Veins draining the intercostal spaces posteriorly; those of the first 1-C space drain into the brachiocephalic veins; from spaces 2-3 they drain into right and left superior intercostal veins; from the fourth to the eleventh spaces on the right they are tributaries of the azygos vein; on the left they empty into either the hemiazygos or accessory hemiazygos veins. Synonym: venae intercostales posteriores. (05 Mar 2000) |
| posterior intermediate groove | A longitudinal furrow between the posterior median and the posterolateral sulci of the spinal cord in the cervical region, marking the gracile fasciculus from the cuneate fasciculus. Synonym: sulcus intermedius posterior, posterior intermediate groove. (05 Mar 2000) |
| posterior intermediate sulcus | A longitudinal furrow between the posterior median and the posterolateral sulci of the spinal cord in the cervical region, marking the gracile fasciculus from the cuneate fasciculus. Synonym: sulcus intermedius posterior, posterior intermediate groove. (05 Mar 2000) |
| posterior interosseous artery | <anatomy, artery> Origin, common interosseous artery; distribution, posterior compartment of forearm. Synonym: arteria interossea posterior, dorsal interosseous artery. (05 Mar 2000) |
| posterior interventricular artery | <anatomy, artery> Posterior interventricular branch of right coronary artery. Continuation of right coronary artery in posterior interventricular sulcus; descends to apex to anastomose with anterior interventricular artery; supplies most of diaphragmatic aspect of ventricles and posterior third of interventricular septum. Synonym: ramus interventricularis posterior arteriae coronariae dextrae, posterior descending artery. (05 Mar 2000) |
| posterior interventricular groove | A groove on the diaphragmatic surface of the heart, marking the location of the septum between the two ventricles. Synonym: sulcus interventricularis posterior, crena cordis. (05 Mar 2000) |