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Which part of the face does the ophthalmic branch mainly serve?

  1. Top 1/3

  2. Middle 1/3

  3. Bottom 1/3

  4. None of the above

The correct answer is: Top 1/3

The ophthalmic branch primarily serves the top part of the face. Specifically, it innervates areas around the forehead, upper eyelids, and the bridge of the nose. This branch is a division of the trigeminal nerve (cranial nerve V), which is responsible for sensory functions of the face. The middle and bottom portions of the face are served by the maxillary and mandibular branches, respectively. Understanding the distribution of these branches is crucial for estheticians, particularly when performing facial treatments and understanding facial structure and sensation. Overall, recognizing that the ophthalmic branch focuses on the upper third of the face highlights its role in facial anatomy and skin care practices.