The supranuclear innervation originates in the lower pre-central gyrus, with the contralateral contribution larger than the ipsilateral. These fibers, as part of the corticobulbar tract, descend in the genu of the internal capsule, course through the cerebral peduncles, and are distributed to the motor nuclei of the trigeminal nerve that lies in the middle of the pons medial to the main sensory nucleus. The fibers leave the pons ventral to the sensory fibers. The motor root lies against the trigeminal ganglion and is incorporated into the mandibular division of the sensory nerve.