Final answer:
The clavicles are S-shaped bones that position the arms on the body and are located across the front of the thorax. They are susceptible to fractures and articulate with the sternum and the scapula.
Step-by-step explanation:
The clavicles are S-shaped bones that position the arms on the body. The clavicles lie horizontally across the front of the thorax (chest) just above the first rib. These bones are fairly fragile and are susceptible to fractures. For example, a fall with the arms outstretched causes the force to be transmitted to the clavicles, which can break if the force is excessive. The clavicle articulates with the sternum and the scapula.