Where is the synovial membrane found in diarthrotic joints?

• A. Outside the joint capsule
• B. Between the bones only
• C. Lining the joint capsule
• D. On the outer surface of ligaments

Answer: (C)

The synovial membrane is an essential component of diarthrotic joints, commonly known as synovial joints. It is found lining the inner walls of the joint capsule. This membrane plays a crucial role in the joint's function by secreting synovial fluid, which lubricates the joint, reduces friction, and nourishes the articular cartilage. The presence of the synovial membrane within the joint capsule allows for the proper functioning and movement of the joint, making it flexible and capable of withstanding the pressures exerted on it during activity.

In contrast, other options do not accurately describe the location or function of the synovial membrane. For instance, being outside the joint capsule or between bones is not where the synovial membrane is situated, as it specifically lines the joint cavity within the capsule. Additionally, the synovial membrane does not cover the outer surface of ligaments but instead operates within the confines of the joint. This understanding is fundamental in recognizing the structural and functional aspects of diarthrotic joints in athletic training.