How does the clavicle connect the shoulder to the chest?

The clavicle, or collarbone, acts as a structural strut that connects the shoulder to the axial skeleton, specifically the chest. It functions as a bridge through two primary articulations:12

• Medial Connection: The inner (medial) end of the clavicle articulates with the manubrium of the sternum (breastbone) at the sternoclavicular joint. This connection is further supported by the costoclavicular ligament, which attaches the bone to the first rib.12
• Lateral Connection: The outer (lateral) end of the clavicle articulates with the acromion—a projection of the scapula (shoulder blade)—at the acromioclavicular joint.123

By bracing the shoulder, the clavicle helps distribute weight from the arm and shoulder to the chest and provides a stable base for the pectoral girdle to facilitate movement. Additionally, it serves as an attachment site for muscles, including the pectoralis major, and creates a protective space for vital nerves and blood vessels.2