gnatho-, gnath-, -gnatha, -gnathan, -gnath, -gnathia, -gnathic, -gnathous
(Greek: jaw)
The jaw is the name applied to the bones which contain the teeth.
The two upper jaw-bones, the maxillae, are firmly attached to the other bones of the face.
The lower jaw, the mandible, is shaped in a form similar to that of a horseshoe, and, after the first year of life, it consists of a single bone.
It forms a hinge-joint with the squamous part (thin, plate-like section) of the temporal bone, immediately in front of the ear.
Both the upper and the lower jaw-bones include deep sockets known as alveoli, which contain the roots of the teeth.
2. A fetal malformation with little of the head formed except the jaws.
In humans, the fetus is the unborn child from the end of the eighth week after conception to the moment of birth, as distinguished from the earlier embryo.
2. A field of dental or medical study which deals with the entire chewing apparatus, including its anatomic, histological, morphological, physiologic, and pathological characteristics.
Diagnostic, therapeutic, and any necessary rehabilitative procedures can be determined by such research results.
2. Repairing surgery or plastic surgery of the jaw.
2. Any leglike appendage of a crustacean, when modified wholly, or in part, to serve as a jaw; especially, one of the maxillipeds or one of the six specialized feeding appendages arranged in pairs and located just behind the maxillae (upper jawbone) on the heads of crustaceans.