The masseteric and auriculotemporal nerves originate from which branch of the trigeminal nerve?

• A. Mandibular branch of trigeminal nerve
• B. Ophthalmic branch
• C. Maxillary branch
• D. Abducens nerve

Answer: (A)

The masseteric and auriculotemporal nerves come from the mandibular division of the trigeminal nerve. The trigeminal nerve splits into three divisions: V1 (opthalmic), V2 (maxillary), and V3 (mandibular). Only V3 carries motor fibers to the muscles of mastication, so it gives rise to branches that innervate these muscles and nearby regions. The masseteric nerve supplies the masseter muscle, while the auriculotemporal nerve provides sensory innervation to the temple and external ear and carries parasympathetic fibers to the parotid. The other divisions are purely sensory, and the abducens nerve is a separate cranial nerve, not part of the trigeminal divisions.