The lower jaw (mandible) is the most inferior structure in the anterior view of the skull. It consists of the body of the mandible anteriorly and the ramus of the mandible posteriorly. These meet posteriorly at the angle of the mandible. All these parts of the mandible are visible, to some extent, in the anterior view.
The body of the mandible is arbitrarily divided into two parts:
The lower part is the base of the mandible.
The upper part is the alveolar part of the mandible.