Slight loss and depression of the joint where the abdomen and tendon are touched

The slight loss and depression of the joint between the abdominal muscle and the tendon can be felt locally. It is more common in muscle strains. The tendon consists of collagen fibers and does not have the ability to contract. The tendon fibers are corrugated at rest, and the corrugations disappear when stretched, and collagen fibers may be slightly damaged when stretched excessively, and even tendon rupture may occur.