Anatomy & Histology · single question
A stroke damages the motor (hypoglossal, CN XII) supply on the RIGHT side. On protrusion, the tongue:
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Correct answer: B. Deviates to the RIGHT (toward the lesion)
- A. Incorrect. The tongue can still be protruded by the intact opposite side; it simply deviates.
- B. Correct. With a lower motor neuron CN XII lesion, the tongue deviates TOWARD the affected (weak) side — here, the right — because the unopposed healthy genioglossus pushes it that way.
- C. Incorrect. Deviation is toward the weak side (right), not away from it.
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