BRAIN
CRANIAL NERVES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Glossopharyngeal (CN IX) & Vagus (CN X)
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Hypoglossal (CN XII)
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Trigeminal (CN V)
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Facial (CN VII)
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Detailed explanation-1: -The 12th (hypoglossal) cranial nerve is evaluated by asking the patient to extend the tongue and inspecting it for atrophy, fasciculations, and weakness (deviation is toward the side of a lesion).
Detailed explanation-2: -The hypoglossal nerve, also known as the twelfth cranial nerve, cranial nerve XII, or simply CN XII, is a cranial nerve that innervates all the extrinsic and intrinsic muscles of the tongue except for the palatoglossus, which is innervated by the vagus nerve. CN XII is a nerve with a solely motor function.
Detailed explanation-3: -The hypoglossal nerve (CN XII) provides motor innervation to all of the intrinsic and extrinsic muscles of the tongue except for the palatoglossus muscle, which is innervated by the vagus nerve (CN X).
Detailed explanation-4: -Cranial Nerve XII To test the hypoglossal nerve, have the patient protrude their tongue. Assess for deviation of the tongue, atrophy, and fasciculations. [3] Atrophy, fasciculations, and deviation in the direction of the lesion are associated with lower motor neuron pathology.