| occipitomastoid suture | Continuation of the lambdoid suture between the posterior border of the petrous portion of the temporal bone and the occipital. Synonym: sutura occipitomastoidea. (05 Mar 2000) |
|---|---|
| occipitomental | Relating to the occiput and the chin. (05 Mar 2000) |
| occipitomental diameter | The diameter of the foetal head from the external occipital protuberance to the midpoint of the chin. (05 Mar 2000) |
| occipitomental projection | A PA radiographic view of the skull made with the orbitomeatal line at an angle of 37 |
| occipitoparietal | Relating to the occipital and the parietal bones. (05 Mar 2000) |
| occipitopontine tract | A group of fibres originating in the occipital lobe of the cerebral hemisphere and descending in the internal capsule and lateral part of the crus cerebri to the pontine nuclei or ventral part of the pons. Synonym: tractus occipitopontinus. (05 Mar 2000) |
| occipitoposterior position | A cephalic presentation of the foetus with its occiput turned toward the right (right occipitoposterior, ROP) or to the left (left occipitoposterior, LOP) sacroiliac joint of the mother. (05 Mar 2000) |
| occipitotectal tract | The system of nerve fibres by which the occipital cortex projects to the superior colliculus. Synonym: occipitocollicular tract. (05 Mar 2000) |
| occipitotemporal | Relating to the occiput and the temple, or the occipital and the temporal bones. (05 Mar 2000) |
| occipitotemporal sulcus | A long, deep sagittal fissure on the undersurface of the temporal lobe, marking the border between the fusiform gyrus laterally and the hippocampal and lingual gyri medially; the great depth of the collateral sulcus results in a bulging of the floor of the occipital and temporal horn of the lateral ventricle, the collateral eminence. Synonym: sulcus collateralis, sulcus occipitotemporalis, collateral fissure, fissura collateralis, occipitotemporal sulcus. (05 Mar 2000) |
| occipitothalamic | Relating to the nerve fibres leading from the occipital lobe of the cerebral cortex to the thalamus. (05 Mar 2000) |
| occipitothalamic radiation | The massive, fanlike fibre system passing from the lateral geniculate body of the thalamus to the visual cortex (striate or calcarine cortex, area 17 of Brodmann); the fibres follow the retrolenticular and sublenticular limbs of the internal capsule into the corona radiata but they curve back along the lateral wall of the temporal and occipital horns of the lateral ventricle to the striate cortex on the medial surface and pole of the occipital lobe. Synonym: radiatio optica, geniculocalcarine radiation, geniculocalcarine tract, Gratiolet's fibres, Gratiolet's radiation, occipitothalamic radiation, Wernicke's radiation. (05 Mar 2000) |
| occipitotransverse position | A cephalic presentation of the foetus with its occiput turned toward the right (right occipitotransverse, ROT) or to the left (left occipitotransverse, LOT) iliac fossa of the mother. (05 Mar 2000) |
| occiput | Origin: L, fr. Ob (see Ob-) + caput head. See Chief. 1. <anatomy> The back, or posterior, part of the head or skull; the region of the occipital bone. 2. <zoology> A plate which forms the back part of the head of insects. Source: Websters Dictionary (01 Mar 1998) |
| occlude | 1. To shut up; to close. 2. <chemistry> To take in and retain; to absorb; said especially with respect to gases; as iron, platinum, and palladium occlude large volumes of hydrogen. Origin: L. Occludere, occlusum; ob (see Ob-) + claudere to shut. Source: Websters Dictionary (01 Mar 1998) |