occipital horn


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pos·te·ri·or horn

1. the occipital or posterior division of the lateral ventricle of the brain, extending backward into the occipital lobe;
See also: posterior column.
2. the posterior horn or gray column of the spinal cord as appearing in cross section. The posterior horn [TA] or dorsal horn [TAalt] contains spinal laminae I-VI [TA] of Rexed. The nuclei of the posterior horn are the marginal nucleus [TA] (nucleus marginalis [TA]), gelatinous substance [TA] (substantia gelatinosa [TA]), nucleus proprius [TA], secondary visceral grey substance [TA] (substantia visceralis secundaria [TA]), internal basilar nucleus [TA] (nucleus basilar internus [TA]), medial cervical nucleus [TA] (nucleus cervicalis medialis [TA]), posterior nucleus of lateral funiculus [TA] (nucleus posterior funiculi lateralis [TA]), and the lateral cervical nucleus.

occipital horn

Any of the broad, calcified protrusions exostoses that extend caudally from the base of the skull, seen in X-linked type IX Ehlers-Danlos syndrome, which is related to defective copper metabolism, resulting in 2º lysyl oxidase deficiency and by extension, collagen defects.
References in periodicals archive ?
MRI demonstrating dependent restricted diffusion in the area of the right occipital horn, which likely reflects the presence of purulent material.
Areas of subependymal calcification in relation to the right occipital horn.
The CT scan organised by the ophthalmologist showed "a proencphalic dilatation of the occipital horn of the left lateral ventricle with loss of cortex affecting the medial aspect of the occipital lobe" and was thought to be longstanding.
1.) The report indicated a long convoluted tubular density in the lateral ventricles, with a metallic density in the occipital horn of the left lateral ventricle.
A tiny new lesion involving the posterior right thalamus and a slight increase in periventricular T2 signal adjacent to the atrium and occipital horn of the left lateral ventricle appeared.
MRI of brain revealed (i) sub ependymal grey matter heterotopia along the occipital horn and atrium of right lateral ventricle.
There are two short occipital horns and three temporal horns on each side, of which the external horns are the shortest (Horowitz, 1955; Sherbrooke, 2003).
Because patients are usually scanned in the supine position, particularly important locations include the interpeduncular cistern, the occipital horns of the lateral ventricles, the quadrigeminal plate cistern, and the dependent portions of the Sylvian fissures (Figure 1).
That report stated, inter alias "The lateral ventricles are enlarged, including the atria, occipital horns and body.
* a CSF-filled cleft lined by grey matter extending from the subarachnoid space from the right parietal lobe region communicating with the trigone and occipital horns of the right lateral ventricle
Axial T2 and FLAIR images showed dilated occipital horns of both lateral ventricles.
Radiographic findings of dysgenesis or agenesis of the corpus callosum include absence of, or a malformed corpus callosum (Figure 15), and parallel orientation of the lateral ventricles; normally the frontal horns lie closer together than the occipital horns of the lateral ventricles.