What bones make up the shoulder girdle?

The shoulder girdle, also known as the pectoral girdle, is comprised of the scapula (shoulder blade) and clavicle (collarbone). These two bones are crucial for connecting the upper limb to the torso and providing a range of motion for the shoulder. The scapula allows for the attachment of various muscles that control arm movement, while the clavicle acts as a strut that stabilizes the shoulder and supports arm movements.

In contrast, the other options include bone combinations that serve different functions in the body. The humerus and radius are part of the upper arm and forearm, the tibia and fibula are found in the lower leg, and the pelvis and sternum are part of the lower body and torso, respectively. None of these combinations contribute to the structure and function of the shoulder girdle as the scapula and clavicle do.