A tendon (or sinew) is a tough band of fibrous connective tissue that usually connects muscle to bone eMedicine/Stedman Medical Dictionary Lookup! and is capable of withstanding tension. Tendons are similar to ligaments and fascia as they are all made of collagen except that ligaments join one bone to another bone, and fascia connect muscles to other muscles. Tendons and muscles work together and can only exert a pulling force. Structure Normal healthy tendons are mostly composed of parallel ar… (More on Tendon)