accessory nuclei of optic tract

(redirected from posterior nucleus)

accessory nuclei of optic tract

[TA]
small groups of neuron cell bodies located along the trajectory of optic fibers in the mesencephalon. These consist of the posterior nucleus [TA] (nucleus posterior [TA]), medial nucleus [TA] (nucleus medialis [TA]), and lateral nucleus [TA] (nucleus lateralis [TA]), which are also called the posterior, medial, and lateral terminal nuclei. The connections of these nuclei, along with the nucleus of the optic tract, make up the accessory optic system that appears to be concerned with retinal slip in specific directions.
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24] Recently, this research team [25] used an automated extraction method (which is more efficient that the ROI method) in patients with OCD and found decreased blood flow in the left inferior temporal lobe, supramarginal gyrus, transverse temporal gyrus, outer dorsal nuclei, outer posterior nucleus, intercalated nucleus, and increased blood flow in the left superior parietal lobule, and the dorsal thalamus.
Although there may be a vestibulo-cerebellocortical pathway in addition, the four major vestibulocortical pathways all involve the thalamus either the lateral posterior nucleus, the ventral posterior nucleus, the medial geniculate nucleus, or the ventrolateral geniculate nucleus (see Berthoz, 1996; Smith, 1997 for reviews).
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