The anterior ethmoidal nerve is a branch of which nerve?

Prepare for the Individual Readiness Assurance Test (iRAT) 4 in Head and Neck. Study with multiple-choice questions, comprehensive explanations, and detailed flashcards. Maximize your chances of success with thorough preparation and insightful study resources.

The anterior ethmoidal nerve branches from the nasociliary nerve, which is a branch of the ophthalmic division (V1) of the trigeminal nerve. In the orbit, the nasociliary nerve gives off the anterior ethmoidal nerve as it travels forward, passes through the anterior ethmoidal foramen into the nasal cavity, and then supplies the mucosa of the anterior ethmoidal air cells and the nasal septum. It also gives the external nasal branch to the skin of the nose. The other nerves listed belong to different branches or divisions (for example, the frontal nerve mainly divides into supraorbital and supratrochlear, the lacrimal nerve serves lacrimal structures, and the infraorbital nerve comes from the maxillary division), so they are not the parent of the anterior ethmoidal nerve.