What connects bone to bone at a joint?

The structure that connects bone to bone at a joint is a ligament. Ligaments are made of dense connective tissue that provides stability and support to joints while allowing for controlled movement. Their primary function is to help maintain the proper alignment of bones during movement, preventing dislocations and other injuries that can occur from excessive movement.

Cartilage, while also important in the structure of joints, serves a different role. It acts as a cushioning material that provides a smooth surface for bones to articulate with each other, reducing friction and absorbing shock.

Tendons are connective tissue that links muscles to bones, enabling the movement of bones when muscles contract. They are essential for movement but do not connect bones to one another.

The synovial membrane is the lining of synovial joints that produces synovial fluid, which lubricates the joint and nourishes the cartilage. While it plays a key role in joint health and function, it does not connect bones.

Thus, ligaments play a crucial role specifically in connecting bones to bones at joints, enhancing stability and mobility.