Where and what is the purpose of synovial cavities?
Synovial cavities are joints cavities-they are enclosed within a fibrous capsule that surround the freely movable joints of the body, such as those between vertebrae and the knee and hip joints. Like the serous membranes of the ventral body, membranes lining the synovial cavities secrete a lubricating fluid that reduces friction as the enclosed structures move across one another.