Question:easy
Bell's palsy is associated with the lesion in which of the nerve?
Bell's palsy is associated with the lesion in which of the nerve?
Show Hint
Which cranial nerve controls the muscles of facial expression?
Updated On: Jun 23, 2026
- 11th cranial nerve
- 7th cranial nerve
- 9th cranial nerve
- 3rd cranial nerve
Show Solution
The Correct Option is B
Solution and Explanation
Step 1: A patient with sudden one-sided facial droop, loss of forehead wrinkling and inability to close the eye has a peripheral facial weakness pattern.
Step 2: This presentation defines Bell's palsy, which is an idiopathic dysfunction of the nerve that motors all the muscles of facial expression - the facial nerve, numbered cranial nerve VII.
Step 3: Because cranial nerves XI, IX and III control trapezius/sternocleidomastoid, pharynx and eye movements respectively, none of them produces facial-expression palsy.
\[\boxed{\text{7th cranial nerve}}\]
Step 2: This presentation defines Bell's palsy, which is an idiopathic dysfunction of the nerve that motors all the muscles of facial expression - the facial nerve, numbered cranial nerve VII.
Step 3: Because cranial nerves XI, IX and III control trapezius/sternocleidomastoid, pharynx and eye movements respectively, none of them produces facial-expression palsy.
\[\boxed{\text{7th cranial nerve}}\]
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