Which two branches of CN V1 supply the most medial portion of the upper eyelid?

Which two branches of CN V1 supply the most medial portion of the upper eyelid?

• A. Lacrimal nerve and Supraorbital nerve
• B. Supratrochlear nerve and Infratrochlear nerve
• C. Supraorbital nerve and Supratrochlear nerve
• D. Infratrochlear nerve and Lacrimal nerve

Answer: (B)

The most medial portion of the upper eyelid gets its sensation from nerves that travel along the medial orbital rim: the supratrochlear nerve, a branch of the frontal nerve (CN V1), and the infratrochlear nerve, a branch of the nasociliary nerve (CN V1). The supratrochlear nerve exits medially above the trochlea to innervate the medial upper eyelid and nearby forehead, while the infratrochlear nerve runs toward the medial canthus to supply the medial eyelid. In contrast, the lacrimal nerve is more lateral (lateral upper eyelid and lacrimal gland) and the supraorbital nerve supplies the forehead and the upper eyelid more laterally. Thus, the two nerves that supply the most medial part of the upper eyelid are the supratrochlear nerve and the infratrochlear nerve.

The most medial portion of the upper eyelid gets its sensation from nerves that travel along the medial orbital rim: the supratrochlear nerve, a branch of the frontal nerve (CN V1), and the infratrochlear nerve, a branch of the nasociliary nerve (CN V1). The supratrochlear nerve exits medially above the trochlea to innervate the medial upper eyelid and nearby forehead, while the infratrochlear nerve runs toward the medial canthus to supply the medial eyelid. In contrast, the lacrimal nerve is more lateral (lateral upper eyelid and lacrimal gland) and the supraorbital nerve supplies the forehead and the upper eyelid more laterally. Thus, the two nerves that supply the most medial part of the upper eyelid are the supratrochlear nerve and the infratrochlear nerve.