ANATOMY

Detailed explanation-1: -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-2: -The craniofacial muscles are essential to chewing and making facial expressions. They originate from bone or fascia and insert into your skin. Craniofacial muscles work together to control movements in your: Cheeks.

Detailed explanation-3: -Within the motor system, although the muscles of mastication are innervated by the trigeminal nerve (V), the muscles of facial expression are innervated mainly by the facial nerve (VII).

Detailed explanation-4: -The facial nerve controls the muscles that help you smile, frown, wrinkle your nose, and raise your eyebrows and forehead. This seventh cranial nerve performs motor and sensory functions.

Detailed explanation-5: -Lacrimation (tearing) and salivation are also stimulated by the 7th cranial nerve. The 7th cranial nerve also has some sensory component including the sense of taste (anterior 2/3 of the tongue).