THE CRANIUM The cranium or skull is the main skeletal structure of the head. It is divided into the brain case or cranial vault and the facial bones. Of all the 22 bones of the skull, 21 are immobile and fused together. Only the mandible or lower jaw is separate and mobile. Figure 36 shows what the anterior view of the cranium and facial bones looks like:
From the anterior view, the skull can be seen as mainly showing the facial bones. The upper and lower jaw is formed as the maxilla and mandible, respectively, which houses the teeth. The orbit is the eye socket that houses the eyeball and the muscles that move it. On the upper side of the eye socket is the supraorbital margin, which contains a small opening called the supraorbital foramen. This is where the nerve that serves the sensation of the forehead comes 80
