Final answer:
The appendicular skeleton includes the bones of the upper and lower limbs, along with the pectoral and pelvic girdles which attach these limbs to the trunk of the body, allowing for mobility and stability.
Step-by-step explanation:
The appendicular skeleton is an essential part of the human skeletal system. It consists of the bones that form the pectoral girdle and the pelvic girdle, as well as the upper and lower extremities. The pectoral or shoulder girdle connects the upper limbs to the trunk and is comprised of the clavicle (collarbone) and the scapula (shoulder blade) on each side of the body. This girdle allows for a significant range of motion, which is crucial for the mobility of the upper limbs.
On the other hand, the pelvic girdle attaches the lower limbs to the trunk, supporting abdominal organs and ensuring stability and weight-bearing. It is connected to the axial skeleton by ligaments and consists of the ilium, pubis, and ischium that are fused in adults. Each lower limb is made up of 30 bones, enabling standing and movement such as walking and running. This division of the skeleton is critical for both mobility and manipulation of objects, enabling humans to perform a wide array of activities.