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Which bones form the shoulder girdle?

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Front and back views of the human skeleton are shown side by side, with labeled bones including the skull, spine, ribs, pelvis, arms, legs, hands, and feet. Insets detail the bones of the foot and hand, highlighting major bone groups and anatomical terms. — human skeleton Front and back views of the human skeleton.

The shoulder girdle, also known as the pectoral girdle, is the bony structure that connects the arm to the axial skeleton. In humans, it is composed of two primary bones on each side of the body:12

Clavicle: Commonly known as the collarbone, this S-shaped bone braces the shoulder and distributes weight from the arm to the axial skeleton.1
Scapula: Often called the shoulder blade, this flat, triangular bone provides a site for muscle attachment and features the glenoid cavity, which articulates with the humerus to form the shoulder joint.1

These bones work together to provide structural support for the shoulder and facilitate a wide range of motion for the upper extremities.1