What are the primary bones of the upper extremity?

The primary bones of the upper extremity include the humerus, radius, ulna, scapula, and clavicle.

The humerus is the long bone in the upper arm that extends from the shoulder to the elbow, playing a crucial role in arm movement. The radius and ulna are the two bones of the forearm, with the radius located on the thumb side and the ulna on the opposite side. They facilitate forearm movement and stability at the elbow joint. The scapula, also known as the shoulder blade, connects the humerus to the body and provides attachment points for various muscles that enable shoulder movement. The clavicle, or collarbone, serves as a strut between the shoulder blade and sternum, providing support and stabilization.

This combination of bones is essential for the overall function, mobility, and support of the upper limb during various activities, such as lifting, reaching, and manipulating objects. Understanding the anatomy of these bones is fundamental for evaluating upper extremity function and addressing related injuries or conditions.