CN V1 is known as the __________ division of the trigeminal nerve.

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

CN V1 is known as the __________ division of the trigeminal nerve.

Explanation:
The ophthalmic division of the trigeminal nerve is the front-most, purely sensory branch that supplies sensation to the forehead, scalp, upper eyelid, cornea, and the bridge of the nose. It travels through the superior orbital fissure to reach the orbit and its branches—such as the nasociliary, frontal, and lacrimal nerves—carry those sensory signals from the eye region and nearby structures. The other divisions, which handle the midface and lower face and, in the case of the mandibular division, motor fibers to muscles of mastication, are separate. The accessory nerve is not part of the trigeminal system at all. Therefore, CN V1 is known as the ophthalmic division.

The ophthalmic division of the trigeminal nerve is the front-most, purely sensory branch that supplies sensation to the forehead, scalp, upper eyelid, cornea, and the bridge of the nose. It travels through the superior orbital fissure to reach the orbit and its branches—such as the nasociliary, frontal, and lacrimal nerves—carry those sensory signals from the eye region and nearby structures. The other divisions, which handle the midface and lower face and, in the case of the mandibular division, motor fibers to muscles of mastication, are separate. The accessory nerve is not part of the trigeminal system at all. Therefore, CN V1 is known as the ophthalmic division.

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