How the jaw works

Movements of the jaw, such as chewing, are controlled by various muscles. Three main muscles close our mouth, and one main muscle aids with opening it. This makes sense when you think about gravity’s effect on the body. We need a bit more help to close our mouth and bite into our food than we do to open it and let it hang.

What is the structure of the jaw?

Your jaw is a set of bones that holds your teeth. It consists of two main parts. The upper part is the maxilla . It doesn’t move. The moveable lower part is called the mandible. You move it when you talk or chew. The two halves of the mandible meet at your chin. The joint where the mandible meets your skull is the temporomandibular joint.

What is the structure of the human jaw bone?

It is a U-shaped bone which extends from one ear down to the chin and back up to the ear on the other side of the head. Vertical extensions of the mandible form left and right joints with the main portion of the skull, the cranium, to form the jawbone joints.

What is the human jaw?

[edit on Wikidata] The mandible, lower jaw or jawbone is the largest, strongest and lowest bone in the human face. It forms the lower jaw and holds the lower teeth in place. The mandible sits beneath the maxilla. It is the only movable bone of the skull (discounting the ossicles of the middle ear).

What does a human jaw do?

The mandible, or lower jaw, is the bone that forms the lower part of the skull, and along with the maxilla (upper jaw), forms the mouth structure. Movement of the lower jaw opens and closes the mouth and also allows for the chewing of food.

What is joint between the tooth and the jaw?

A gomphosis is the fibrous joint that anchors each tooth to its bony socket within the upper or lower jaw. The tooth is connected to the bony jaw by periodontal ligaments. A narrow syndesmosis is found at the distal tibiofibular joint where the bones are united by fibrous connective tissue and ligaments.

What is the anatomy of the jaw?

Anatomy of the Jaw. In regards to jaw anatomy, the major joint in the jaw is the temporomandibular joint (TMJ) which connects the lower jaw to the skull (temporal bone) under the ear. Some physicians associate disorder in this joint with tiny myofascial trigger points, or contractions (knots), in the overworked or traumatized jaw muscles.

What does on jaw mean?

jaw (noun) the part of the skull of a vertebrate that frames the mouth and holds the teeth . jaw (noun) the bones of the skull that frame the mouth and serve to open it; the bones that hold the teeth. jaw (verb) holding device consisting of one or both of the opposing parts of a tool that close to hold an object.