What is the primary function of the pectoral girdle?

The primary function of the pectoral girdle is to connect the arm to the body. This structure consists of the clavicles (collarbones) and scapulae (shoulder blades), which work together to provide a stable yet flexible connection between the upper limbs and the axial skeleton. This connection allows for a wide range of motion in the arms while maintaining the structural integrity necessary for movements such as reaching, lifting, and throwing.

By anchoring the arms to the body, the pectoral girdle plays a crucial role in upper limb function, enabling the muscles that control arm movement to work effectively. The design of the girdle allows for significant mobility, which is essential for the various activities that involve the upper extremities. Understanding this fundamental role helps clarify why the pectoral girdle is critical in human anatomy and movement.