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Synovial joints are characterized by the presence of synovial membranes, which are essential for their function. These joints are surrounded by a fibrous capsule that contains the synovial membrane, which secretes synovial fluid. This fluid lubricates the joint, reducing friction between the articulating surfaces and allowing for smooth movement. The synovial membrane also plays a role in nourishing the cartilage covering the ends of the bones, as it is involved in the exchange of nutrients and waste products.

In contrast, cartilaginous joints are connected by cartilage and do not have a synovial membrane; they provide limited movement. Fibrous joints, which are connected by dense connective tissue, also lack a synovial membrane and typically permit no movement or very little movement. Bony joints, or synostoses, occur when bones fuse together, and they do not involve synovial membranes either.

Understanding the role of synovial membranes and their presence specifically in synovial joints highlights their importance in facilitating movement and maintaining joint health.