| occipital emissary vein | <anatomy, vein> An inconstant vessel perforating the squama of the occipital bone to connect the occipital veins with the confluens sinuum. Synonym: vena emissaria occipitalis, emissarium occipitale. (05 Mar 2000) |
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| occipital fontanel | A triangular interval at the union of the lambdoid and sagittal sutures where the occipital angles of the parietal bones meet the occipital. Synonym: fonticulus posterior, occipital fontanel. (05 Mar 2000) |
| occipital groove | A narrow groove medial to the mastoid notch of the temporal bone that lodges the occipital artery. Synonym: sulcus arteriae occipitalis, sulcus of occipital artery. (05 Mar 2000) |
| occipital gyri | See: inferior occipital gyrus, superior occipital gyrus. (05 Mar 2000) |
| occipital horn | The posterior or occipital division of the lateral ventricle of the brain, extending backward into the occipital lobe; the posterior gray column of the spinal cord as appearing in cross section. Synonym: cornu posterius ventriculi lateralis, cornu posterius, cornua of spinal cord, occipital horn. (05 Mar 2000) |
| occipital horn syndrome | <syndrome> An X-linked recessive disorder in which there is defective biliary excretion of copper resulting in a deficiency of lysyl oxidase causing skin and joint laxity. Ocular-mucous membrane syndrome, Stevens-Johnson syndrome with associated ocular lesions (conjunctivitis, panophthalmitis, iritis), oral lesions (bullae, erosions, superficial ulcers), and genital lesions (urethritis, balanitis circinata, blebs). (05 Mar 2000) |
| occipital lobe | House the visual interpretation centres. (27 Sep 1997) |
| occipital lobe epilepsy | A localization-related epilepsy where seizures originate from the occipital lobe. Symptoms commonly include visual abnormalities during seizures. (05 Mar 2000) |
| 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) |
| 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) |