What type of joint is lined with synovial membrane?

A synovial joint is characterized by being lined with a synovial membrane, which secretes synovial fluid. This fluid lubricates the joint and reduces friction during movement, allowing for a greater range of motion compared to other types of joints. Synovial joints are typically surrounded by a joint capsule, which is also lined with synovial membrane, providing additional stability and support. Common examples of synovial joints include the knee, elbow, and hip joints.

In contrast, fibrous joints are connected by dense connective tissue and do not have a synovial membrane, making them immovable or only slightly movable. Cartilaginous joints are joined by cartilage, and while they may allow some movement, they similarly lack a synovial membrane. Immovable joints, as the name suggests, do not allow movement, and these joints would not possess a synovial membrane either. Therefore, the presence of the synovial membrane specifically designates the joint as a synovial joint.