BRAIN
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following most accurately describes how a patient with damage to the hypoglossal nerve on the left side?
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Tongue deviated to the right
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Tongue deviates to the left
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -The muscles, attached to the underside of the top and back parts of the tongue, cause the tongue to protrude and deviate towards the opposite side. The hypoglossal nerve also supplies movements including clearing the mouth of saliva and other involuntary activities.
Detailed explanation-2: -In the presence of a lesion of the hypoglossal nerve, the tongue is seen to deviate toward the side of the lesion, toward the weak half, on attempted protrusion (Fig. 33.20). This deficit is due to a paralysis of the genioglossus muscle; fasciculations of the tongue might also be observed.
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