What does the term "synovial" refer to in joint types?

The term "synovial" refers specifically to a type of joint that is characterized by a synovial cavity filled with synovial fluid, which lubricates the joint and allows for smooth movement. Synovial joints are known for their range of motion and include examples such as the knee, elbow, shoulder, and hip joints. These joints allow for various movements, including flexion, extension, rotation, and gliding, making them the most mobile joint type in the human body.

In contrast, immovable joints refer to joints that do not allow any movement, such as sutures in the skull. Partially movable joints, like the intervertebral joints in the spine, permit limited movement, and fixed joints do not allow any motion at all. Understanding the distinction of synovial joints as freely movable is essential for comprehending joint functionality and biomechanics in the context of radiologic technology and human anatomy.