Q- A 32-year-old woman visits her physician because she hasn’t been able to protrude and depress her tongue for the last 2 weeks.
Which of the following is the most likely affected muscle?
A- Genioglossus muscle
B- Hyoglossus muscle
C- Styloglossus muscle
D- Palatoglossus muscle
Answer and Explanation
The genioglossus muscle is responsible for protruding and depressing the tongue. It is innervated by the hypoglossal nerve (cranial nerve XII). Damage to the hypoglossal nerve or the muscle itself can lead to tongue deviation (if unilateral) or difficulty protruding and depressing the tongue (if bilateral).
Hyoglossus muscle depresses and retracts the tongue. Styloglossus muscle retracts and elevates the tongue. Palatoglossus muscle elevates the posterior tongue and is innervated by the vagus nerve (CN X), not the hypoglossal nerve.
Since the patient cannot protrude and depress the tongue, the most likely affected muscle is the genioglossus.
The correct answer is A
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I don’t think so but you have to confirm with the program director.
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