Which of the following structures is unique to a synovial joint? Accessory ligaments Bursae Collateral ligaments Fibrocartilage Joint cavity

The structure that is unique to a synovial joint is the Joint cavity.

Here's a step-by-step explanation:

1. Accessory ligaments: These are not unique to synovial joints. They are found in many types of joints, providing stability and strength.

2. Bursae: These are small fluid-filled sacs that reduce friction between moving parts in the body's joints. They are not unique to synovial joints.

3. Collateral ligaments: These are found in many types of joints, not just synovial. They are bands of fibrous tissue that prevent abnormal movements of the joint.

4. Fibrocartilage: This is a type of cartilage that provides cushioning and shock absorption in many types of joints, not just synovial.

5. Joint cavity: This is a space that exists between the articulating bones of a synovial joint. It is filled with synovial fluid, which lubricates the joint and allows for smooth movement. This structure is unique to synovial joints.