Tuesday, January 10, 2012
Corticostriate fibers are fibers that connect the cerebral cortex with the striatum, extending from all areas of the neocortex to the striatum. They are made up of medium-sized axons and small pyramidal cells of the fifth layer. However, there are no fiber connections extending from the striatum to the cortex. The corticostriate projection reveals a topical organization: the frontal lobe projects to the head of the caudate nucleus and is followed by the parietal lobe, the occipital lobe, and the temporal lobe. The projection of the precentral motor area in the putamen reveals a somatotopic organization: head, arm, and leg. A somatotopic projection of the postcentral sensory area to the dorsolateral region of the caudate nucleus has been demonstrated. The fibers from areas adjoining the central sulcus are the only ones that partly cross via the corpus callosum to the contralateral neostriatum.