Thalamic afferents to the motor cortex in the cat. A horseradish peroxidase study.

Thalamic projections to the motor cortex have been studied in the cat by injecting small amounts of horseradish peroxidase in different parts of areas 4 and 6. The nuclei which more abundantly project to the motor cortex are the ventral anterior-ventral lateral complex, the ventral medial and the posterior complex. These projections are topographically organized. Other projections arise from the ventral postero-lateral, ventral postero-inferior, central lateral, central medial, medial dorsal, lateral posterior-pulvinar, suprageniculate and centrum medianum-parafascicular nuclei.