Ligaments tie the bones together to form joints.
Each bone and each joint has a name. The bone of the thigh is called the femur, the bones of the leg are called the tibia and fibula, and the joint between these bones is called the knee joint. The skeleton and all its parts are moved by muscles and tendons. Bones, ligaments, muscles, and tendons are the tissues of the locomotor or musculoskeletal system of the body. Bones are covered with fibrous membrane called periosteum .