Describe the structure of the joint.

Each joint has articular surfaces of bones covered with hyaline cartilage, an articular capsule, and an articular cavity filled with fluid. Articular cartilage has different thicknesses (it depends on the load on the joint), is devoid of blood vessels and perichondrium, and protects the surfaces of bones from mechanical stress. The joint capsule covers the surface of the joint and consists of a dense outer layer and an inner layer that secretes joint fluid, the amount of which varies. Joint fluid serves to nourish the cartilage and reduce friction in the joint. To better match the shape of the articular surfaces of the bones, inside some joints there are additional cartilaginous formations – discs, menisci, for example, in the temporomandibular and knee joints.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.