Skeleton

The skeleton is the body’s framework of bones. Although bones are hard, the skeleton is not simply a rigid structure: it works with muscles and joints to make physical activity possible. It also protects organs and performs important functions inside the body.

The skeleton is the framework of bones in the body. Learning bone locations gives you a precise way to describe the body during physical activity: an upper-arm bone and a forearm bone are not interchangeable, even though both belong to the arm.