Which classification describes the glenohumeral joint?

The glenohumeral joint is classified as a diarthrosis, which indicates that it is a freely movable joint. This joint, commonly known as the shoulder joint, allows for a wide range of motion in multiple directions, including flexion, extension, abduction, adduction, and rotation. The diarthrodial classification is characterized by the presence of a joint capsule filled with synovial fluid, which lubricates the joint and facilitates movement. This type of joint structure supports the extensive mobility needed for various activities, from reaching overhead to throwing.

In contrast, synarthrosis refers to a type of joint that is immovable, typically found in locations such as the sutures of the skull. Amphiarthrosis describes joints that allow for slight movement, such as the joints between the vertebrae, and cartilaginous joints are characterized by cartilage connecting the articulating bones, which do not allow for the same degree of freedom as a diarthrosis. Thus, the classification of the glenohumeral joint as a diarthrosis is accurate, emphasizing its capability for significant movement and flexibility.