Final answer:
The outline of the breast consists of the two converging lines formed by the clavicle and scapula.
Step-by-step explanation:
The outline of the breast consists of the two converging lines formed by the clavicle and scapula. The clavicle, also known as the collarbone, runs horizontally across the upper chest area, while the scapula, also known as the shoulder blade, is a triangular-shaped bone that sits on the back of the ribcage. When these two bones come together, they form an outline that defines the shape of the breast.