What description fits the membranes that line joint cavities?

The membranes that line joint cavities are classified as synovial membranes. These specialized membranes play a crucial role in the function of joints by producing synovial fluid, which lubricates the joint and reduces friction between the cartilages of the bones during movement. Synovial membranes are made up of connective tissue and epithelial cells, which work together to ensure that the joint is well-functioning and protected from wear and tear.

Like other types of membranes found in the body, synovial membranes have unique features that differentiate them from mucous, squamous, and serous membranes. For instance, mucous membranes line cavities that open to the external environment and produce mucus for lubrication and protection, while serous membranes line closed body cavities and produce a serous fluid that reduces friction between organs. Squamous membranes are typically descriptive of one layer of flat epithelial cells and do not specifically refer to a functional membrane type in joints.

Thus, synovial membranes are specifically adapted to meet the demands of joint function, allowing for smooth movement and protecting the integrity of joints.