GROSS ANATOMY

Detailed explanation-1: -Sensation on the face is innervated by the trigeminal nerves (V) as are the muscles of mastication, but the muscles of facial expression are innervated mainly by the facial nerve (VII) as is the sensation of taste.

Detailed explanation-2: -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-3: -The facial nerve provides motor innervation of facial muscles that are responsible for facial expression, parasympathetic innervation of the glands of the oral cavity and the lacrimal gland, and sensory innervation of the anterior two-thirds of the tongue.

Detailed explanation-4: -The facial nerve is the seventh cranial nerve (CN VII). It arises from the brain stem and extends posteriorly to the abducens nerve and anteriorly to the vestibulocochlear nerve.

Detailed explanation-5: -cranial nerves exit from the brainstem CN 5, the trigeminal nerve exits the mid/lower pons. CN 7, the facial nerve exits the pontomedullary junction. CN 9, the glossopharyngeal nerve exits the lateral medulla. CN 10, the vagus nerve exits the lateral medulla.