What type of joints are characterized by a fibrous joint capsule continuous with the periosteum?

The correct answer describes synovial joints. These joints are characterized by the presence of a joint capsule that is fibrous in nature, which extends from the periosteum of the bone. This fibrous joint capsule envelops the joint space and provides stability while allowing for a range of motion. Inside the capsule, synovial fluid is present, which lubricates the joint and provides nutrients to the cartilage.

Understanding the structure and function of synovial joints is important for grasping how movement occurs in the body. They typically allow for a wide range of movements and include examples such as the knee, elbow, and shoulder joints. The fibrous capsule is essential in maintaining the structural integrity of the joint while permitting flexibility needed for movement.

In contrast, fibrous joints do not have this type of capsule and are generally immovable, such as the sutures in the skull. Cartilaginous joints, while providing some flexibility and cushioning, are not surrounded by a fibrous capsule but instead have cartilage connecting the bones. Fixed joints refer to immovable joints as well, emphasizing stability over mobility, such as those found in the spine. Understanding these differences helps in recognizing the diverse structures and functions of joints within the body.