Seventh cranial nerve

Seventh cranial nerve or the facial nerve is a paired structure of the human body that controls the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue and oral cavity. It also supplies preganglionic parasympathetic fibers to several head and neck ganglia.

Structure

The facial nerve is the seventh of the twelve cranial nerves. It emerges from the pons of the brainstem, controls the muscles of facial expression, and functions in the conveyance of taste sensations from the anterior two-thirds of the tongue and oral cavity. It also supplies preganglionic parasympathetic fibers to several head and neck ganglia.

Function

The facial nerve performs two major functions. It supplies the muscles of facial expression, allowing us to smile, frown, and make other facial expressions. It also provides taste sensations from the anterior two-thirds of the tongue.

Clinical significance

Damage to the facial nerve can result in facial paralysis. This can occur as a result of several medical conditions, including Bell's palsy, Lyme disease, and stroke. Treatment for facial nerve damage depends on the underlying cause and may include medications, physical therapy, or surgery.

See also

• Cranial nerves
• Facial paralysis
• Bell's palsy
• Lyme disease
• Stroke

References

Seventh cranial nerve Resources
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