Which joint type is created where two bones articulate to permit a variety of motions?

• A. Synovial joints
• B. Symphysis
• C. Fibrous joint
• D. Cartilaginous joint

Answer: (A)

Synovial joints are the joints that allow a wide variety of movements between two bones. They have a joint cavity filled with synovial fluid, articular cartilage on the bone ends, a fibrous joint capsule, and reinforcing ligaments. This combination creates a freely movable (diarthrotic) joint, capable of many movement patterns such as bending, rotating, and gliding, depending on the specific shape (like ball-and-socket, hinge, pivot, saddle, plane, or condyloid).

Other joint types lack this joint cavity and synovial fluid, which limits their mobility. Fibrous joints are usually immovable or only slightly movable and are connected by dense connective tissue. Cartilaginous joints involve cartilage and can be slightly movable (or immovable), but they don’t have the fluid-filled cavity and capsule that enable a wide range of motion typical of synovial joints. Symphysis is a type of cartilaginous joint with fibrocartilage that allows limited movement.