Final answer:
The pectoral girdle is comprised of the clavicle and the scapula, which connect the upper limbs to the body's trunk and allow for a wide range of motion.
Step-by-step explanation:
The question concerns the composition of the pectoral girdle, which is part of the human skeletal system. The pectoral girdle consists of two main bones: the clavicle and the scapula. The clavicle, also known as the collarbone, is an S-shaped bone located anteriorly (at the front) and connects at one end to the sternum of the thoracic cage (part of the axial skeleton). On the other end, it joins with the scapula just above the shoulder joint. The scapula, also known as the shoulder blade, is a flat bone positioned on the posterior (back) side of the body and helps form the shoulder joint. Together, these bones allow for a considerable range of motion and transfer the forces from the upper limb to the trunk.