Which bone or bones does not/do not belong to the axial skeleton?
The appendicular skeleton is the portion of the skeleton of vertebrates consisting of the bones or cartilage that support the appendages. The appendicular skeleton consists of the girdles and the skeleton of the limbs. The upper (anterior) limbs are attached to the pectoral (shoulder) girdle and the lower (posterior) limbs are attached to the pelvic (hip) girdle.