Synovial cavities are joint cavities enclosed within fibrous capsules that surround which type of joints?

Synovial cavities are joint cavities enclosed within fibrous capsules that surround which type of joints?

• A. Immovable joints
• B. Freely movable joints
• C. Fixed joints
• D. Cartilaginous joints

Answer: (B)

Freely movable joints are the ones with a synovial cavity. This cavity is the hallmark of synovial (diarthrotic) joints, which are enclosed by a fibrous capsule and lined with a synovial membrane that produces lubricating fluid. This design allows a wide range of motion, so the presence of a synovial cavity identifies joints that are freely movable. Other joint types—fibrous joints, which have no cavity and are typically immovable, and cartilaginous joints, which have cartilage between bones with limited motion—do not contain a synovial cavity.

Freely movable joints are the ones with a synovial cavity. This cavity is the hallmark of synovial (diarthrotic) joints, which are enclosed by a fibrous capsule and lined with a synovial membrane that produces lubricating fluid. This design allows a wide range of motion, so the presence of a synovial cavity identifies joints that are freely movable. Other joint types—fibrous joints, which have no cavity and are typically immovable, and cartilaginous joints, which have cartilage between bones with limited motion—do not contain a synovial cavity.