periosteum is the pain center of the bone. When a bone
fractures, the pain that is felt comes from the
periosteum, not the bone proper. Periosteum also forms
new bone. The diaphysis is the elongated, cylindrical
portion (or shaft) of the bone that is between the
epiphyses (sing. epiphysis) or ends of the bone.
Bones are classified according to their shape. The
four bone classifications and examples of each are as
Long bonesfemur and humerus
Short boneswrist and ankle bones
Flat bonesskull, sternum, and scapula
Irregular bonesvertebrae, mandible, and
DIVISIONS OF SKELETON
The human skeleton is divided into two main
divisions, the axial skeleton and the appendicular
The axial skeleton consists of the skull, the
vertebral column, and the thorax.
Figure 1-13.Human skeleton.