Which type of joint allows for the least movement and is characterized by the bony edges interlocking?

• A. Synovial joint
• B. Cartilaginous joint
• C. Fibrous joint
• D. Saddle joint

Answer: (C)

The type of joint that allows for the least movement and features bony edges that interlock is the fibrous joint. These joints are held together by dense connective tissue, which provides significant stability and limits movement. An example of a fibrous joint is the sutures of the skull, where the bones are interlocked and have no movement between them, thus forming a protective casing for the brain.

In contrast, synovial joints are highly movable and characterized by a joint cavity containing synovial fluid, which facilitates a wide range of motion. Cartilaginous joints allow for some movement, often described as slightly movable, and are typically connected by cartilage. Saddle joints are a specific type of synovial joint that allows for a greater range of motion than fibrous or cartilaginous joints, such as the joint at the base of the thumb. Thus, the definition and characteristics of fibrous joints clearly indicate their minimal movement capabilities.