What are the components of the shoulder girdle?

The shoulder girdle, also known as the pectoral girdle, consists of two primary bones: the clavicle and the scapula. These components work together to connect the upper limb to the trunk and facilitate a wide range of motion at the shoulder joint.

The clavicle, or collarbone, serves as a strut that stabilizes the shoulder and connects the arm to the body, while the scapula, or shoulder blade, provides a base for various muscle attachments and plays a key role in arm movement. The articulation between the clavicle and the scapula at the acromioclavicular joint is essential for shoulder mobility.

In contrast, the other options list different combinations of bones that do not comprise the entire shoulder girdle. For instance, the humerus, radius, and ulna are bones primarily associated with the arm and forearm rather than the components of the shoulder girdle. Therefore, identifying the correct components as the clavicle and scapula is crucial for understanding the anatomy and function of the shoulder region.