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Superior View of Deep Cerebral Structures

Surgical Correlation

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Superior view of deep cerebral structures. The corpus callosum is a massive midline fiber bundle that contains commissural fibers.  It connects reciprocal areas of the two cerebral hemispheres. The tapetum of the corpus callosum is the continuation of these fibers as they arc laterally over the lateral ventricles. In the right hemisphere, located near the midline and superior to the corpus callosum, can be seen the cingulum, an associational fiber pathway located within the cingulate gyrus.  The cingulum is a part of the limbic system and connects limbic cortices in the ventromedial frontal lobe with the hippocampus and entorhinal cortex in the temporal lobe. In the left hemisphere, the fornix has been dissected.  The latter structure is a prominent, bidirectional C-shaped fiber pathway that connects the hippocampus and entorhinal cortex in the temporal lobe with the hypothalamus (especially the mammillary bodies) and septal region.  In the right hemisphere, the uncinate fasciculus has been dissected and connects the lateral orbitofrontal cortices with the anteromedial temporal lobe.  Several components of the basal ganglia are seen also in this dissection.  The caudate nucleus is visible in the left hemisphere as it courses along the lateral edge of the frontal and parietal portions of the lateral ventricle.  In the right hemisphere, medial to the uncinate fasciculus, can be seen the nucleus accumbens or ventral striatum.  (Image courtesy of AL Rhoton, Jr.)

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