Answer :
Final answer:
The facial nerve (VII) innervates superficial muscles of facial expression which enable us to create facial expressions. It does not control the deep muscles of the neck, muscles involved in chewing, or muscles in the limbs. Other cranial nerves control various other skeletal muscles and organs.
Explanation:
Human facial muscles are primarily controlled by two cranial nerves. The facial nerve (VII) innervates superficial muscles of facial expression, involved in creating our diverse range of facial expressions. These muscles are unique as they insert into the skin rather than bones which allows them to produce intricate movements in the skin that conveys our expressions. The facial nerve (VII) does not control the deep muscles of the neck, muscles in the limbs, or the muscles involved in chewing. The muscles involved in chewing are controlled by the trigeminal nerve, tested for stretch reflexes. The muscles of the neck and the limbs are controlled by other nerves, not by cranial nerves VII or V. Other cranial nerves control eye movements and function in the control of gaze. They also serve in the regulation of the organs of the thoracic and upper abdominal cavities and control muscles of the oral cavity, and pharynx, which assist with swallowing and speech. The motor control of the gag reflex is largely controlled by fibers in the vagus nerve.
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