Final answer:
The appendicular skeleton includes 126 bones that comprise the extremities' framework, the shoulder girdle for connecting upper limbs, and the pelvic girdle for attaching lower limbs and supporting abdominal organs.
Step-by-step explanation:
The appendicular skeleton consists of 126 bones and forms the framework for the extremities, including the shoulders and hips. These bones are essential for movement, attachment of the limbs, and protection of organs. The shoulder girdle (pectoral girdle) attaches the upper limbs to the thoracic cage, while the pelvic girdle connects the lower limbs to the vertebral column, supporting the organs of the abdomen.
The appendicular skeleton is categorized into two main groups: the bones within the limbs themselves and the girdle bones. The girdle bones include the scapula and clavicle in the shoulder, which facilitate upper limb mobility, and the pelvic girdle, comprised of the ilium, pubis, and ischium, which supports lower limb attachment and the abdominal organs.