The document describes three types of bones in the human skeleton: 1) Long bones have a shaft and two extremities. Short bones are roughly cuboid in shape and found in the wrist and foot. 2) Flat bones are composed of two plates of compact bone with spongy bone and marrow in between, such as the skull bones. 3) Irregular bones do not have a distinct shape, like the vertebrae and facial bones. The document then lists the total number of bones in the adult human skeleton, divided into the axial skeleton (74 bones including the skull and vertebrae) and appendicular skeleton (126 bones including the upper and lower extremities). There are a