The joint is formed by two or more bones connected to each other by strong cords – ligaments of connective tissue. One of the bones forms the articular head, the other the articular cavity. The head and cavity are covered with smooth articular cartilage. This facilitates the movement of bones. The joint is in the joint bag. Its walls secrete articular fluid, which reduces friction of bones during movement and nourishes articular cartilage, in which there are no blood capillaries.
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