GROSS ANATOMY

Detailed explanation-1: -The muscles of facial expression are innervated by the facial nerve (cranial nerve VII), and the muscles of mastication are innervated by the mandibular division of the trigeminal nerve (cranial nerve V3).

Detailed explanation-2: -Their function is to innervate the muscles of facial expression, the stapedius muscle, the stylohyoid muscle, and the posterior belly of the digastric muscle.

Detailed explanation-3: -The facial nerve is the 7th cranial nerve and carries nerve fibers that control facial movement and expression. The facial nerve also carries nerves that are involved in taste to the anterior 2/3 of the tongue and producing tears (lacrimal gland).

Detailed explanation-4: -Cranial nerve VII is named the facial nerve and cranial nerve IX is called the glossopharyngeal nerve. Of the three pairs of salivary glands, the facial nerve innervates two. The facial nerve innervates the submandibular and sublingual glands, whereas the glossopharyngeal nerve innervates the parotid gland.

Detailed explanation-5: -The facial nerve supplies motor and sensory innervation to the muscles formed by the second pharyngeal arch, including the muscles of facial expression, the posterior belly of the digastric, stylohyoid, and stapedius.