Washington Esthetician State Board Practice Exam

The infratrochlear nerve affects which part of the body?

1. Skin of the forehead

2. Membrane and skin of the nose

3. Lips and chin

4. Cheeks and jaw

The correct answer is: Membrane and skin of the nose

The infratrochlear nerve is primarily responsible for providing sensory innervation to the membrane and skin of the nose. This includes the area around the bridge of the nose and the inner canthus of the eye, which are critical for sensory perception. Understanding the specific areas controlled by this nerve is essential for estheticians, as it helps in identifying potential sensitivities or reactions in clients during facial treatments or procedures involving the nasal region. In contrast, other options pertain to different regions of the face that are innervated by other nerves. The skin of the forehead is primarily affected by the frontal branch of the trigeminal nerve, while the lips and chin receive sensation from the mandibular division of the trigeminal nerve. The cheeks and jaw areas are also innervated by branches of the trigeminal nerve, specifically the maxillary and mandibular divisions. Understanding the anatomical distribution of these nerves not only aids in performing treatments safely but also enhances the esthetician's ability to communicate effectively with clients about procedures that may impact these areas.