The Masseter Muscle is a powerful jaw muscle responsible for closing the jaw during activities such as chewing and biting. It is one of the primary muscles involved in mastication (chewing) and is crucial for various oral functions. The masseter is located on each side of the face and is easily palpable during jaw movement. Originating from the zygomatic arch (cheekbone), the masseter muscle inserts into the mandible's angle and ramus (the vertical and posterior portions of the lower jaw). It is divided into two parts: the superficial masseter and the deep masseter. Both parts work synergistically to elevate and close the jaw. The masseter muscle's contraction is controlled by the trigeminal nerve (cranial nerve V). This muscle's robust nature is essential for generating the force required for effective chewing and maintaining proper oral function. Dysfunction or disorders affecting the masseter can lead to conditions such as temporomandibular joint (TMJ) disorders, causing pain and limitations in jaw movement. Clinicians may assess the masseter muscle during examinations to identify abnormalities or issues related to jaw function. Treatment options for masseter-related problems may include physical therapy, dental interventions, and, in some cases, medications to manage pain and inflammation.
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