Introduction about Corticobulbar MEP The muscles of the face, head and neck are controlled by the corticobulbar system, which terminates on motor neurons within brain-stem motor nuclei. Contrast this to the corticospinal tract were the cerebral cortex connects to spinal motor neurons, and controls movement of the torso, upper and lower limbs.. Which cranial nerve comes … Continue reading Intraoperative Neurophysiological Monitoring (IONM) Role in Corticobulbar MEP Transcranial Electrical Motor Evoked potential in skull base and posterior fossa  surgery .