"In human anatomy, the arm is the part of the upper limb between the glenohumeral joint (shoulder joint) and the elbow joint.
In common usage, the arm ...
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extends to the hand. It can be divided into the upper arm (sometimes called aftarm), which extends from the shoulder to the elbow, the forearm (also called antebrachium) which extends from the elbow to the hand, and the hand.
Anatomically the shoulder girdle with bones and corresponding muscles is by definition a part of the arm. The Latin term brachium may refer to either the arm as a whole or to the upper arm on its own. The use of "antebrachium" to refer to forearm is in the sense of brachium just being the upper (aft) arm." - (en.wikipedia.org 29.02.2020)
