Where is the facial motor nucleus located?

Where is the facial motor nucleus located?

• A. Upper pons
• B. Lower pons
• C. Medulla
• D. Midbrain

Answer: (B)

The facial motor nucleus is located in the caudal (lower) portion of the pons. It sits in the tegmentum of the lower pons near the floor of the fourth ventricle, and its axons join to form the facial nerve as it exits at the pontomedullary junction. This placement explains why lesions affecting this nucleus or the nerve lead to facial weakness on the same side. The midbrain, upper pons, and medulla host other cranial nerve nuclei, so they don’t fit this question.

The facial motor nucleus is located in the caudal (lower) portion of the pons. It sits in the tegmentum of the lower pons near the floor of the fourth ventricle, and its axons join to form the facial nerve as it exits at the pontomedullary junction. This placement explains why lesions affecting this nucleus or the nerve lead to facial weakness on the same side. The midbrain, upper pons, and medulla host other cranial nerve nuclei, so they don’t fit this question.