There are 206 bones in the adult human body. These bones form the human skeleton, providing structure, protection for internal organs, and facilitating movement through the attachment of muscles. The skeletal system is divided into two main parts: the axial skeleton, which includes the skull, vertebral column, and rib cage, and the appendicular skeleton, which consists of the bones of the limbs and pelvic girdle. In infants, the number of bones is higher at around 270 because some bones have not yet fused together. Over time, as a person grows, certain bones fuse to form the 206 bones typically found in adults.