Which bone is commonly known as the collarbone?

The clavicle, commonly referred to as the collarbone, serves a critical role in the skeletal structure of the human body. It connects the arm to the body and provides support for the shoulder, helping to stabilize the shoulder joint and allowing for a wide range of arm movements. The clavicle's anatomical positioning is vital as it acts as a strut that keeps the shoulder away from the thorax, which is essential for both the mobility and functionality of the upper limb.

In the context of the other bones mentioned, the scapula, or shoulder blade, plays a role in connecting with the humerus (the upper arm bone) and facilitates movement of the arm and shoulder. The sternum, or breastbone, is located in the center of the chest and is involved in protecting vital organs like the heart and lungs. The humerus is the bone that runs from the shoulder to the elbow. While these bones are all important components of the musculoskeletal system, the unique naming and functional characteristics of the clavicle as the collarbone make it distinctly identifiable and critical to the overall structure and movement of the shoulder girdle.