Safety muscle of tongue is:
**Core Concept**
The safety muscle of the tongue is a critical anatomical structure that plays a vital role in preventing foreign objects from entering the respiratory tract. It is a muscular band that runs from the base of the tongue to the hyoid bone, and its primary function is to act as a protective mechanism during swallowing.
**Why the Correct Answer is Right**
The correct answer is **Hyoglossus muscle**, which is a strap-like muscle that originates from the hyoid bone and inserts into the side of the tongue. When the tongue is protruded, the hyoglossus muscle contracts, causing the tongue to move downward and backward, thereby preventing objects from entering the airway. This muscle is essential for maintaining the integrity of the airway during swallowing and speaking.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the palatoglossus muscle is involved in elevating the tongue and closing the nasopharynx during swallowing, but it is not the safety muscle of the tongue.
* **Option B:** This option is incorrect because the styloglossus muscle is involved in retracting the tongue and elevating the hyoid bone, but it is not the safety muscle of the tongue.
* **Option C:** This option is incorrect because the genioglossus muscle is the primary muscle responsible for protruding the tongue, but it is not the safety muscle of the tongue.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the safety muscle of the tongue is the hyoglossus muscle, which plays a critical role in preventing foreign objects from entering the airway during swallowing.
**Correct Answer:** C.