A 45-year-old woman is suffering from numbness over the tip of her nose. Which of the following nerves is most likely to be damaged?
1.Ophthalmic division of the trigeminal nerve
2.Maxillary division of the trigeminal nerve
3.Mandibular division of the trigeminal nerve
4.Facial nerve
5.Auriculotemporal nerve
exp:
The skin over the tip of the nose is innervated by the external nasal branch of the nasociliary branch of the ophthalmic division of the trigeminal nerve. The maxillary division of the trigeminal nerve innervates the skin of the face above the upper lip but below the lower eyelid. The mandibular division of the trigeminal nerve supplies the lower part of the face below the lower lip. The facial nerve provides no cutaneous sensation on the face but innervates muscles of facial expression. The auriculotemporal nerve is a branch of the mandibular division of the trigeminal nerve and innervates the skin of the auricle and the scalp.