Chronic traumatic bursitis

The bursa is also called a synovial sac, a synovial sac, or a mucous sac. It is an accessory structure of the muscle and tendon, and is a connective tissue flat sac. Most of the bursa exists independently, and a few are in communication with the joint cavity. Every part of the human body that has frequent friction or high pressure has a bursa, which mostly exists between the two friction surfaces of the human's tough structure, such as bone processes, muscles, tendons, ligaments, or skin. The wall of the bursa is divided into two layers, the outer layer is thin and dense fibrous connective tissue, but does not form an envelope; the inner layer is a synovial endothelial cell, which originates from the original mesenchymal tissue and has the function of secreting synovial fluid. The normal bursa is fissured and contains only a small amount of synovial fluid. The bursa has the functions of reducing friction, reducing pressure, and promoting exercise flexibility.

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