The mandible, or lower jaw, is the large U-shaped bone that forms the lower part of the face. It holds the teeth in place and helps with eating, speaking, and chewing. The mandible is the only bone in the face that moves.
The word “mandible” comes from the Latin word for jawbone. The mandible is a U-shaped bone that forms the lower jaw. It is the only bone in the face that moves. The mandible is attached to the skull at two joints: the temporomandibular joints (TMJs).
The TMJs are located on either side of the head, in front of the ears. They allow the mandible to move up and down and side to side. The TMJs are the most used joints in the body.
The mandible has two parts: the body and the ramus. The body is the large, flat part of the bone that forms the chin. The ramus is the smaller, U-shaped part that extends up from the body.
The mandible has two surfaces: the outer surface and the inner surface. The outer surface is smooth. The inner surface is rough. This rough surface has ridges (ridges of bone) that help to keep the teeth in place.