Normal tendon tissue seen under the magnification of a microscope. Ed Reschke / Getty Images

A tendon is a tough yet flexible band of fibrous tissue. The tendon is the structure in your body that connects a muscle to a bone.  Tendons are very organized, as the image shows.  The body creates very tightly wound fibers of collagen that are flexible but very strong.  The strength of tendons is important as these tight structures are required to resist the forces of very heavy loads.

The skeletal muscles in your body are responsible for moving your joints, thus enabling you to walk, jump, lift, and move in many ways.

When a muscle contracts, it pulls on a bone to cause this movement. The structure that transmits the force of the muscle contraction to the bone is called a tendon.

Specific tendons are prone to developing tendonitis, a problem where the tendon becomes irritated and inflamed. The usual reason that tendonitis develops is due to deficiencies in blood supply to the tendon. Certain tendons with a "watershed zone" of blood supply are prone to developing tendonitis, these include:

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