Posterior limb of internal capsule

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Brain: Posterior limb of internal capsule
Horizontal section of right cerebral hemisphere. (Capsula interna labeled at upper left.)
Diagram of the tracts in the internal capsule. Motor tract red. The sensory tract (blue) is not direct, but formed of neurons receiving impulses from below in the thalamus and transmitting them to the cortex. The optic radiation (occipitothalamic) is shown in violet.
Latin	crus posterius capsulae internae
Gray's	subject #189 836
Part of
Components
Artery
Vein
BrainInfo/UW	hier-183
MeSH	[1]

The posterior limb of internal capsule (or occipital part) is the portion of the internal capsule posterior to the genu.

Anterior

The anterior two-thirds of the occipital part of the internal capsule contains fibers of the corticospinal tract, which arise in the motor area of the cerebral cortex and, passing downward through the middle three-fifths of the base of the cerebral peduncle, are continued into the pyramids of the medulla oblongata.

Posterior

The posterior third of the occipital part contains:

• (1) sensory fibers, largely derived from the thalamus, though some may be continued upward from the medial lemniscus;
• (2) the fibers of optic radiation, from the lower visual centers to the cortex of the occipital lobe;
• (3) acoustic fibers, from the lateral lemniscus to the temporal lobe; and
• (4) fibers which pass from the occipital and temporal lobes to the nuclei pontis.

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant. Template:Neuroanatomy-stub

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