The skeleton of the head supports and protects the brain, the organs of the hearing, the view, the smell and the taste and the initial parts of the respiratory and digestive systems.
It is made of several complicated bones, that can usually be isolated only in youngs and -except the mandible and the hyoïd apparatus- are merged in the adult in a complex assembly.
Two main parts are always distinguished from this assembly: the cranium (Cranium) which holds the brain and the face (Facies) essentially formed by two jaws that surround the mouth.
The complex upper jaw is also crossed by the nasal cavity; it is merged to the cranium and motionless in relation to it in the mammals.
The lower jaw is constituted by a single bone on either side, the mandible, which is articulated to the cranium in order to allow movements of grip and chewing of the food.
The only other bony mobile part is the hyoïd apparatus, that holds the tongue, the pharynx and the larynx.