| ADN | antideoxyribonuclease; aortic depressor nerve; associate degree in nursing |
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| AIN | acute interstitial nephritis; American Institute of Nutrition; anterior interosseous nerve |
| AIPFP | acute idiopathic peripheral facial nerve palsy |
| AIS | Abbreviated Injury Scale; amniotic infection syndrome; androgen insensitivity syndrome; anterior int... |
| ANAS | anastomosis; auditory nerve activating substance |
| occipital lobe of cerebrum | The posterior, somewhat pyramid-shaped part of each cerebral hemisphere, demarcated by no distinct surface markings on the lateral convexity of the hemisphere from the parietal and temporal lobes, but sharply delineated from the parietal lobe by the parieto-occipital sulcus on the medial surface. Synonym: lobus occipitalis cerebri, occipital lobe. (05 Mar 2000) |
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| occipital lymph nodes | One or two small nodes along the occipital vessels close to the trapezius muscle that receive afferents from the posterior scalp and drain into the superior deep cervical nodes. Synonym: nodi lymphatici occipitales. (05 Mar 2000) |
| occipital margin | Edge of a bone which articulates with the occipital bone. See: occipital border of parietal bone, occipital border of temporal bone. Synonym: margo occipitalis, occipital margin. (05 Mar 2000) |
| occipital neuralgia | <syndrome> A clinical complex of pain, tenderness, tight neck musculature, vasomotor instability, and ill-defined symptoms such as dizziness and blurred vision as the result of trauma to the neck. Also variously termed occipital or suboccipital neuralgia or neuritis; cervical tension syndrome; cervical myospasm, myositis, or fibrositis. Synonym: cervical fibrositis, cervical tension syndrome. (05 Mar 2000) |
| occipital neurectomy | Excision of greater occipital nerve for the treatment of occipital neuralgia. (05 Mar 2000) |
| occipital neuritis | See: posttraumatic neck syndrome. (05 Mar 2000) |
| occipital operculum | A portion of the occipital lobe of the brain demarcated by the simian fissure (sulcus lunatus cerebri) when present in humans. (05 Mar 2000) |
| occipital part of corpus callosum | Occipital radiation of the corpus callosum; that part of the fibre radiation of the corpus callosum which bends sharply backward into the occipital lobe of the cerebrum. Synonym: forceps major, forceps posterior, occipital part of corpus callosum, pars occipitalis corporis callosi. (05 Mar 2000) |
| occipital plane | The external surface of the occipital bone above the superior nuchal line. Synonym: planum occipitale. (05 Mar 2000) |
| occipital plexus | An autonomic plexus on the occipital artery derived from the external carotid plexus. Synonym: plexus occipitalis. (05 Mar 2000) |
| occipital point | The most prominent posterior point on the occipital bone above the inion. (05 Mar 2000) |
| occipital pole | The most posterior promontory of each cerebral hemisphere; the apex of the occipital lobe. Synonym: polus occipitalis cerebri, occipital pole. Pelvic pole, the breech end of the foetus. (05 Mar 2000) |
| occipital pole of cerebrum | The most posterior promontory of each cerebral hemisphere; the apex of the occipital lobe. Synonym: polus occipitalis cerebri, occipital pole. Pelvic pole, the breech end of the foetus. (05 Mar 2000) |
| occipital region of head | The surface region of the head corresponding to the outlines of the occipital bone. Synonym: regio occipitalis capitis. (05 Mar 2000) |
| occipital sinus | An unpaired dural venous sinus commencing at the confluence of the sinuses and passing downward in the base of the falx cerebelli to the foramen magnum. Synonym: sinus occipitalis. (05 Mar 2000) |