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Stepwise Fiber Dissection E-H

Surgical Correlation

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E, The fibers of the internal capsule that course between the posterior part of the lentiform nucleus and thalamus have been removed. The anterior limb of the internal capsule descends between the caudate head and lentiform nucleus and the posterior limb passes between the lentiform nucleus and thalamus. The head, body, and tail of the caudate nucleus are exposed in the wall of the ventricle. The tail of the caudate nucleus extends along the lateral edge of the thalamus. The head of the hippocampus is located in the floor of the temporal horn. The amygdala forms the anterior wall of the temporal horn. F, Enlarged view. Some of the ependyma over the calcar avis has been removed. The choroid plexus is attached along the choroidal fissure. G, Lateral view. The lentiform nucleus has been removed to expose the internal capsule. The anterior limb courses between the caudate nucleus and lentiform nucleus and has a darker color than the posterior limb because of the bridges of transcapsular gray matter extending across the internal capsule between the caudate and lentiform nuclei. The posterior limb of the internal capsule is located lateral to the thalamus. The optic tract passes backward to reach the lateral geniculate body. The fibers of the internal capsula descend to form the cerebral peduncle located medial to the optic tract. The superior and inferior colliculi are exposed in the quadrigeminal cistern. H, Anterior view of dissection shown in G. The putamen and globus pallidus are positional on the lateral side of the internal capsule and the caudate nucleus is on the medial side. The anterior limb of the internal capsule descends between the caudate head and the lentiform nucleus. (Images courtesy of AL Rhoton, Jr.)

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