Which bone is known as the collarbone?

The correct answer is the clavicle, which is commonly referred to as the collarbone. This bone is an elongated S-shaped structure located at the front of the thorax, serving as a critical connection point between the arm and the torso. It plays an essential role in the skeletal system by providing stability and support to the shoulder, as well as protecting the delicate blood vessels and nerves that are crucial to arm function.

In addition to its anatomical importance, the clavicle is notable for its visibility and palpable nature under the skin, making it easy to identify in both clinical and anatomical contexts. This bone also acts as a lever that aids in the movement of the arm, making it essential in activities like lifting and throwing.

Other choices represent different bones in the body. The scapula, or shoulder blade, is a flat bone located in the upper back that connects with the clavicle and humerus. The humerus is the long bone of the upper arm that extends from the shoulder to the elbow. The radius is one of the two long bones in the forearm, positioned on the lateral side of the forearm when in standard anatomical position. Understanding the role of the clavicle within the skeletal system highlights its significance compared to these other bones.