Texas Medical Assistant Certification Practice Test

Which type of joint is immovable?

1. Synovial

2. Fibrous

3. Cartilaginous

4. Ball-and-socket

The correct answer is: Fibrous

The correct answer is fibrous joints, which are classified as immovable joints. These joints are characterized by the fact that they are connected by dense connective tissue, primarily composed of collagen fibers. This structure does not allow for any movement between the bones, making fibrous joints stable and secure. An example of a fibrous joint is the sutures found in the skull, which serve to protect the brain and provide structural integrity as they fuse over time. The lack of mobility in these joints is crucial for maintaining the overall shape and function of the skull. In contrast, synovial joints are designed for a wide range of movements, featuring a synovial cavity filled with fluid that lubricates the joint. Cartilaginous joints allow for some movement, typically providing flexibility and support through cartilage between the bones. Ball-and-socket joints, a subtype of synovial joints, offer the greatest range of motion, allowing for movements in multiple directions, which is not the case for immovable joints like the fibrous type.