What does the joint capsule of the shoulder blend with?

The joint capsule of the shoulder primarily blends with the muscles of the rotator cuff. The rotator cuff consists of four muscles—supraspinatus, infraspinatus, teres minor, and subscapularis—that are essential for stabilizing the shoulder joint and facilitating a wide range of motion. These muscles not only provide support and stability to the humeral head within the glenoid cavity of the scapula but are also closely associated with the joint capsule, creating a functional unit that helps to maintain the integrity of the joint during movement. This integration is crucial for optimal joint function and protection against injuries.

In contrast, the other options do not accurately reflect the anatomical relationship. The capsule does not blend with the clavicle and the first rib, as their connection is primarily through ligaments. While the shoulder joint is associated with the scapula and the humerus, it is not accurate to say the joint capsule itself blends with these bones directly. Lastly, while the biceps and triceps tendons are important structures in the shoulder region, they do not blend with the joint capsule in the same manner as the rotator cuff muscles.