Normal peristalsis depends upon the interaction between muscles, nerve cells and tendinous connective tissue. The tendinous intersections define the anatomy of the rectus abdominis and assist with physiological movement. The muscle is crossed by three fibrous bands called the tendinous intersections. The tendons of these two muscles are surrounded by a tendinous sheath. The presence of palmar xanthomata, like the presence of tendinous xanthomata, is indicative of hypercholesterolaemia. It sometimes presents, immediately above its origin, a transverse tendinous inscription. The rest of the muscle arises by numerous short tendinous fibers. It is almost always crossed by a tendinous intersection near its insertion. Frequently, it sends a tendinous slip to the short muscles of the thumb. Tendinous fibers are rarely found and are in single direction. Tendinous fibers extend to the greater tubercle with insertions into the bicipital groove.