Your jaw plays a crucial role in your day-to-day life, from chewing food to speaking clearly. Yet, it's often overlooked until something goes wrong. Learn about the anatomy and functions of the upper and lower jaws, the bones, joints and muscles involved in mastication. The web page also explains the difference between the maxilla and the mandible, and the temporomandibular joint. Jaw, either of a pair of bones that form the framework of the mouth of vertebrate animals , usually containing teeth and including a movable lower jaw (mandible) and fixed upper jaw (maxilla). JAW definition: 1. the lower part of your face that moves when you open your mouth: 2. either of the two bones in…. Learn more.
