What area of the face will be affected by Bell's palsy?

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Prepare for the NBEO Ocular Anatomy Posterior Segment and Cranial Nerves Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

What area of the face will be affected by Bell's palsy?

Explanation:
Bell's palsy is a peripheral facial nerve (CN VII) problem, so the motor supply to all muscles of facial expression on the affected side is lost. Because the facial nerve innervates muscles on that same side of the face, the weakness or paralysis spans the entire ipsilateral half of the face, including the forehead and the mouth. This is why the area affected is the ipsilateral entire half of the face. In contrast, central (upper motor neuron) lesions spare the forehead due to bilateral cortical input and typically affect the opposite lower face, which is not the pattern seen in Bell's palsy.

Bell's palsy is a peripheral facial nerve (CN VII) problem, so the motor supply to all muscles of facial expression on the affected side is lost. Because the facial nerve innervates muscles on that same side of the face, the weakness or paralysis spans the entire ipsilateral half of the face, including the forehead and the mouth. This is why the area affected is the ipsilateral entire half of the face. In contrast, central (upper motor neuron) lesions spare the forehead due to bilateral cortical input and typically affect the opposite lower face, which is not the pattern seen in Bell's palsy.

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