What is the name of the skeletal system portion that includes the arms, legs, pelvis, and shoulder girdle?

The appendicular skeleton refers specifically to the part of the skeletal system that comprises the limbs and their associated girdles. This includes the arms and legs, as well as the pelvis (which connects the legs) and the shoulder girdle (which connects the arms). The main role of the appendicular skeleton is to facilitate movement and provide support for the body's limbs during various activities.

In contrast, the axial skeleton includes the bones that form the central axis of the body, such as the skull, spine, and rib cage. The terms "pelvic girdle" and "cranial skeleton" refer to more specific areas within the skeletal system: the pelvic girdle only includes the bones of the pelvis, while the cranial skeleton is focused on the skull bones.