bone, joint, and muscle disorders
Tendons and Bursae
Introduction
 are tough bands of connective tissue made up mostly of a rigid protein called collagen. Tendons firmly attach each end of a muscle to a Bones . They are often located within sheaths, which are lubricated to allow the tendons to move without friction. Tendons connect the ends of muscles to bones, whereas ligaments connect bones to other bones. are small fluid-filled sacs that can lie under a tendon, cushioning the tendon and protecting it from injury. Bursae also provide extra cushioning to adjacent structures that otherwise might rub against each other, causing wear and tear—for example, between a bone and a Ligaments or a bony prominence and overlying skin (such as in the elbow, kneecap, or shoulder area). 