Which of the following fibres don&;t pass through the posterior limb of internal capsule
Correct Answer: Coiconuclear
Description: The internal capsule is an area of white matter (axons) in the brain that separates the caudate nucleus and the thalamus (both are medially placed) from the lenticular nucleus (laterally placed). It chiefly consists of axonal fibers that run between the cerebral coex and the pyramids of the medulla. The internal capsule is V-shaped when cut both coronally and horizontally. When cut horizontally the bend in the V is called the genu, the pa in front of the genu is the anterior limb, and the pa behind the genu is called the posterior limb. There is also a retrolenticular and a sublenticular pa to the internal capsule. The posterior limb of the internal capsule contains coicospinal fibers and sensory fibers from the body. The genu contains coicobulbar (or coico-nuclear) fibers, which run between the coex and the brainstem. The retrolenticular pa contains fibers from the optic system, coming from the lateral geniculate nucleus of the thalamus More posteriorly, this becomes the optic radiation. Some fibers from the medial geniculate nucleus (which carry auditory information) also pass in the sublenticular pa. Blood supply Striate aeries, which come off the middle cerebral aery, enter through the anterior perforated substance in the base of the brain. Infarctions to the internal capsule tend to be small, punctate lesions. They can affect sensory and motor systems on the opposite side of the body, and possibly eyesight (to the contralateral visual field). Hearing should not be affected in a single capsule lesion, as this information crosses over to both sides of the brain while in the brainstem.
Category:
Anatomy
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