Questions: The buccinator muscle is innervated by the . vagus nerve trigeminal nerve abducens nerve facial nerve

The buccinator muscle is innervated by the . vagus nerve trigeminal nerve abducens nerve facial nerve
Transcript text: The buccinator muscle is innervated by the $\qquad$ . vagus nerve trigeminal nerve abducens nerve facial nerve
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Solution

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The answer is the fourth one (or D): facial nerve.

Explanation for each option:

  • Vagus nerve: Incorrect. The vagus nerve primarily innervates structures in the thorax and abdomen, and it is not responsible for innervating the buccinator muscle.
  • Trigeminal nerve: Incorrect. The trigeminal nerve is responsible for sensation in the face and motor functions such as biting and chewing, but it does not innervate the buccinator muscle.
  • Abducens nerve: Incorrect. The abducens nerve innervates the lateral rectus muscle of the eye, which is involved in eye movement, not the buccinator muscle.
  • Facial nerve: Correct. The facial nerve (cranial nerve VII) innervates the muscles of facial expression, including the buccinator muscle.

Summary: The buccinator muscle is innervated by the facial nerve.

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