Small, irregularly shaped bones, called sutural or wormian bones, are found where two ormore other bones meet in the skull. The facial bones and vertebrae are all examples of this type. Irregular bones are those in various shapes andsizes. Flat bones contain the red bone marrow in which blood cells are manufactured. Their thin, broad area helps protect inner organs and/or provide surface area for muscle attachment. The shoulder blade (scapula), some of the skull bones, ribs, and breastbone (ster-num), are all examples of flat bone. Most of the carpals-the small bones lo-cated in the wrist (except pisiform, sesamoid bone)- and most of the tarsals-the small bones in the ankle region (except calcaneus, irregular bone)-are good examples of short bones.įlat bones are broad and thin with a flattenedand/or curved surface. Short bones are almost equal in length, width,and height. The femur or thighbone, the humerus of the arm, metacarpals, metatarsals, and phalanges are a few examples. Long bones, as thename suggests, are long, with the length being greater than the width. The bones of the body are classified, according to shape, as long bones, short bones, flat bones, and irregular bones (see Figure 3.4).
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