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pectoral girdles
attach bones of upper limbs to axial skeletion by a series of muscle. each pectoral girdle consists of a clavicle and scapula

clavicle
anterior bone and articulates with manibruim of sternum at sternoclavicular joint

scapula
shoulder blade
large triangular flat bone in superior part of posterior thorax between the levels of the second and seventh ribs
humerus
arm bone, longest and largest bone of the upper limb. articulates proximally with scapula to form shoulder joint and distally with two bones (ulna/radius) to form elbow joint