Which joint type features a joint cavity and synovial fluid, enabling free movement?

Which joint type features a joint cavity and synovial fluid, enabling free movement?

• A. fibrous joints
• B. cartilaginous joints
• C. synovial joints
• D. hinge joints

Answer: (C)

The main idea is that a joint with a joint cavity filled with synovial fluid is a synovial joint, and this setup allows the most freedom of movement. Synovial joints have an articular capsule that encloses a fluid-filled cavity. The synovial fluid lubricates the surfaces, reducing friction and nourishing the cartilage, which together enable a wide range of motion. In contrast, fibrous joints lack a joint cavity and are typically fixed or only slightly movable, while cartilaginous joints have cartilage between the bones and allow limited movement. A hinge joint is a subtype of synovial joints that mainly allows movement in one plane, but the defining feature for free movement is the synovial cavity with fluid.

The main idea is that a joint with a joint cavity filled with synovial fluid is a synovial joint, and this setup allows the most freedom of movement. Synovial joints have an articular capsule that encloses a fluid-filled cavity. The synovial fluid lubricates the surfaces, reducing friction and nourishing the cartilage, which together enable a wide range of motion. In contrast, fibrous joints lack a joint cavity and are typically fixed or only slightly movable, while cartilaginous joints have cartilage between the bones and allow limited movement. A hinge joint is a subtype of synovial joints that mainly allows movement in one plane, but the defining feature for free movement is the synovial cavity with fluid.