The nucleus of the hypoglossal nerve exists in the medulla, lateral to the midline and under the floor of the fourth ventricle. CN XII exits the skull via the hypoglossal canal.
CN XII motor function is tested by ensuring the patient can move his/her tongue side to side and that there is no deviation.
Each CN XII innervates the ipsilateral side of the tongue; unilateral damage will lead to tongue deviation TOWARD the affected side.
Picmonic's rapid review multiple-choice quiz allows you to assess your knowledge.START QUIZ NOW
*Average video play time: 2-3 minutes
Unforgettable characters with concise but impactful videos (2-4 min each)