HOSA Dental Terminology Practice

What is the primary function of the masseter muscle?

1. Opening the mouth

2. Closing the mouth

3. Protruding the jaw

4. Grinding food

The correct answer is: Closing the mouth

The primary function of the masseter muscle is to close the mouth. This muscle is one of the major muscles involved in the process of mastication, or chewing. When the masseter contracts, it acts to elevate the mandible (lower jaw) toward the maxilla (upper jaw), thus enabling the mouth to close. This function is essential for biting and grinding food, which are vital parts of the digestion process. The masseter’s strength allows for powerful closure of the jaw, facilitating efficient food processing before it enters the digestive tract. Understanding this function is crucial for dental professionals as it relates to various aspects of oral health and the mechanics of chewing.