Dictionary of Biological Psychology
The corticospinal or pyramidal tract conveys commands for highly skilled voluntary movements from the MOTOR CORTEX to somatic MOTOR NEURONS in the SPINAL CORD that innervate skeletal or voluntary muscles.
Most of the fibres cross over to the opposite side in the MEDULLA, so that the motor cortex on one side controls muscles on the opposite side of the body. The crossed fibres descend in the lateral column of the spinal cord, and are referred to as the lateral corticospinal tract. A small minority of the fibres remain uncrossed and descend in the anterior column as the anterior corticospinal tract.
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