There are two divisions of the corticospinal tract, the lateral corticospinal tract and the anterior corticospinal tract. The lateral corticospinal tract neurons cross the midline in the spinal cord, and controls the limbs and digits.[1][2] The lateral tract forms about 90% of connections in the corticospinal tract;[3] most of these (about 80% of the total neurons) cross over in the medulla, while the rest (about 10% of the total) cross over at their corresponding place in the spinal cord. The anterior corticospinal tract neurons, the remaining 10%, stay on the same side of the body, and control the trunk muscles.[1]