**Synovial joint (SS)** is the connective tissue of a joint that provides it with mobility in two or more directions.
Translated from Greek, synovial joint is the membrane, in this case, of the joint. The fibrous structure, consisting of 2–4 layers, is approximately 50 times smaller in size than the joint itself. It covers the capsule, fused with the articular cartilage, and intra-articular ligaments.
The joint capsule (capsule) is firmly attached to the cartilage on one side. Unlike cartilage, it is devoid of blood vessels. In other words, it receives nutrition only from the synovium, which receives nutrition through a section of fibrocartilage - capillary sponges. It is for this reason that the synovial membrane of the joints has a grayish tint. Its thickness is 2-3 mm and most of it is occupied by the internal capsular part, although in area it is inferior to the skin and other tissues. The thickness of the synovialized capsule is much thicker than the skin, i.e. it is divided into several mesh layers.