Final answer:
The Internal (Medial) Pterygoid muscle assists in chewing and moving food within the mouth.
Step-by-step explanation:
The internal (medial) pterygoid is a muscle located in the head and neck region. It is one of the muscles of mastication, responsible for the movement of the jaw during chewing. The pterygoid muscles are paired muscles on each side of the skull, and there are two types: the medial pterygoid and the lateral pterygoid.
The function of the Internal (Medial) Pterygoid is to assist in chewing and moving food within the mouth. Along with the masseter and temporalis muscles, the medial pterygoid muscle helps to elevate and close the jaw, breaking food into digestible pieces.