| sulcus parieto-occipitalis | A very deep, almost vertically oriented fissure on the medial surface of the cerebral cortex, marking the border between the parietal lobe and the cuneus of the occipital lobe; its lower part curves forward and fuses with the anterior extent of the calcarine fissure (sulcus calcarinus); the great depth of this combined fissure causes a bulge in the medial wall of the occipital horn of the lateral ventricle, the calcar avis. Synonym: sulcus parieto-occipitalis, fissura parietooccipitalis, parieto-occipital fissure. (05 Mar 2000) |
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| synchondrosis petro-occipitalis | Fibrocartilage filling the petro-occipital fissure. Synonym: synchondrosis petro-occipitalis. (05 Mar 2000) |
| synchondrosis spheno-occipitalis | Cartilaginous union between the body of the sphenoid and the basilar portion of the occipital; it fuses by the twentieth year; incorrectly called spheno-occipital suture. Synonym: synchondrosis spheno-occipitalis, spheno-occipital joint, spheno-occipital suture. (05 Mar 2000) |
| incisura jugularis ossis occipitalis | The notch in the occipital bone which forms one boundary of the jugular foramen. Synonym: incisura jugularis ossis occipitalis. (05 Mar 2000) |
| occipitalis | <anatomy> The posterior belly of the occipitofrontalis muscle. See: occipitofrontalis muscle. Synonym: venter occipitalis musculi occipitofrontalis, occipitalis muscle. (05 Mar 2000) |
| torus occipitalis | An occasional ridge near the superior nuchal line of the occipital bone. (05 Mar 2000) |
| trachelo-occipitalis | Archaic term for semispinalis capitis muscle. (05 Mar 2000) |
| fissura petro-occipitalis | A fissure between the petrous part of the temporal bone and the basilar part of the occipital bone that extends anteromedially from the jugular foramen; includes the jugular foramem (at its posterior end). Synonym: fissura petro-occipitalis, Ecker's fissure. (05 Mar 2000) |