Bones of the skeleton can be grouped into the following major types: long, short, flat, and irregular. Each type has a somewhat different construction pattern.
a. Long Bones. The basic structure of a long bone is illustrated in figure 4-1 and discussed in paragraph 4-4. Example: femur.
Example: carpal bones.
c. Flat Bones. The flat bones are constructed with two plates of compact bone, which enclose between them a layer of spongy bone. The spongy bone is richly supplied with blood vessels and red marrow. Example: the cranial frontal bone.
d. Irregular Bones. The irregular bones are those that do not fit into the three categories above. Example: a vertebra.
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