The corticospinal tracts that synapse on motor neurons in the anterior horns of the spinal cord are visible as they descend along the ventral surface of the medulla as a pair of thick bands, the . The corticospinal tracts that synapse on motor neurons in the anterior horns of the spinal cord are visible as they descend along the ventral surface of the medulla as a pair of thick bands, the . pyramids reticular formation peduncles olives medial lemniscus