is the pain center of the bone. When there is a fracture, the pain you feel comes from the periosteum, not the bone proper. Periosteum also forms new bone.
Figure 3-13.—Structure of a typical long bone.
CLASSIFICATION. Bones are classified according to shape, as follows:
Figure 3-14.—Lateral view of the skull.
Figure 3-15.—Frontal bones.
DIVISIONS OF SKELETON
The human skeleton is divided into two main divisions, the axial skeleton and the appendicular skeleton. The axial skeleton consists of the skull, the vertebral column, and the thorax. The skull bones are further divided into the cranial and facial bones. The appendicular skeleton consists of the bones of the upper and lower extremities. Axial Skeleton SKULL.—Consists of 28 bones (figs. 3-14 and 3-15), 22 of which form the framework of the head and provide protection for the brain, eyes,