Which option correctly lists the three main branches of the trigeminal nerve?

Which option correctly lists the three main branches of the trigeminal nerve?

• A. Ophthalmic Nerve (V1), Maxillary Nerve (V2), and Mandibular Nerve (V3)
• B. Maxillary Nerve (V2)
• C. Trigeminal Nerve supplies sensation to the face via the facial nerve
• D. Ophthalmic Nerve (V1) and Mandibular Nerve (V3)

Answer: (A)

The key idea is that the trigeminal nerve (cranial nerve V) has three distinct sensory (and for one branch, motor) divisions that cover the face: ophthalmic (V1), maxillary (V2), and mandibular (V3). Each branch supplies its own facial territory, forming the face’s main sensory map. Ophthalmic (V1) is the upper branch, carrying sensation from the forehead, scalp, upper eyelid, and cornea. Maxillary (V2) covers the midface—cheek, upper lip, nasal mucosa, and surrounding areas. Mandibular (V3) serves the lower face, including the jaw and lower teeth, and also contains motor fibers to the muscles of mastication. Therefore, listing all three—ophthalmic, maxillary, and mandibular—accurately represents the three main branches of the trigeminal nerve. The other statements are incomplete or inaccurate: sensation to the face is carried directly by the trigeminal nerve, not via the facial nerve, and one option omits one of the branches.

The key idea is that the trigeminal nerve (cranial nerve V) has three distinct sensory (and for one branch, motor) divisions that cover the face: ophthalmic (V1), maxillary (V2), and mandibular (V3). Each branch supplies its own facial territory, forming the face’s main sensory map.

Ophthalmic (V1) is the upper branch, carrying sensation from the forehead, scalp, upper eyelid, and cornea. Maxillary (V2) covers the midface—cheek, upper lip, nasal mucosa, and surrounding areas. Mandibular (V3) serves the lower face, including the jaw and lower teeth, and also contains motor fibers to the muscles of mastication.

Therefore, listing all three—ophthalmic, maxillary, and mandibular—accurately represents the three main branches of the trigeminal nerve.

The other statements are incomplete or inaccurate: sensation to the face is carried directly by the trigeminal nerve, not via the facial nerve, and one option omits one of the branches.