reasons are found near the midline of the brainstem.

Generally, motor nuclei found higher in the brainstem (i.e., more rostral) innervate muscles that are higher on the face. For example, the oculomotor nucleus contains ?-MNs that innervate muscles of the eye, and is found in the midbrain, the most rostral brainstem component. By contrast, the hypoglossal nucleus, which contains ?-MNs that innervate the tongue, is found in the medulla, the most caudal