A 32 year-old woman visits her physician because she hasn’t been able to protrude and depress her tongue.
Which of the following is the most likely affected muscle?
Genioglossus muscle is the only muscle that has a combined action. It protrudes and depress the tongue. Hypoglossus only depress the tongue.
Do not be confused with hypoglossal nerve which innervates all tongue muscles. Its paralysis leads to shift of the tongue to the same side of lesion.
The correct answer is A