The function of Genioglossus is?
**Core Concept**
The genioglossus muscle is a crucial extrinsic muscle of the tongue, primarily responsible for its protrusion and retraction. It plays a vital role in maintaining the patency of the airway, particularly during sleep.
**Why the Correct Answer is Right**
The genioglossus muscle originates from the mental spine (genial tubercle) of the mandible and inserts into the body of the hyoid bone and the anterior surface of the tongue. When it contracts, it pulls the tongue forward, thus preventing it from falling back and obstructing the airway. This action is crucial during sleep to prevent sleep apnea. The muscle also helps in maintaining the position of the tongue during speech and swallowing.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the genioglossus muscle does not primarily function in elevating the tongue. Other muscles like the palatoglossus and the hyoglossus are responsible for elevating the tongue.
**Option B:** This option is incorrect because the genioglossus muscle does not primarily function in rotating the tongue. The styloglossus muscle is responsible for rotating the tongue.
**Option C:** This option is incorrect because the genioglossus muscle does not primarily function in depressing the hyoid bone. The stylohyoid and the digastric muscles are responsible for depressing the hyoid bone.
**Clinical Pearl / High-Yield Fact**
The genioglossus muscle is a critical muscle in the management of sleep apnea, particularly in patients undergoing uvulopalatopharyngoplasty (UPPP). The muscle's function can be compromised due to various factors, including hypothyroidism, which can lead to sleep apnea.
**Correct Answer:** C. Protruding the tongue.