The arm is the upper limb of the body, comprising regions between the glenohumeral joint (shoulder joint) and the elbow joint.
In common usage the arm extends to the hand. It can be divided into the upper arm (brachium), the forearm (ante brachium), and the hand (manus).
Anatomically the shoulder girdle with bones and corresponding muscles is by definition a part of the arm. The Latin term brachium may refer to both the arm as a whole or to the upper arm on its own