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Arms
In human anatomy, the arm refers specifically to the segment between the shoulder and the elbow. The segment between the elbow and wrist is the forearm. However, in colloquial speech the term arm often refers to the entire upper limb from shoulder to wrist
Anatomy of the Upper Arms
The human arm contains about 30 bones, joints, muscles, nerves, and blood vessels.
The main muscles of the arms include:
Functions of the Arms
In primates the arms are adapted for both climbing and for more skilled, manipulative tasks such as holding and throwing.
The ball and socket shoulder joint allows for movement of the arms in a wide circular plane, while the presence of two forearm bones which can rotate around each other allows for additional range of motion at this level.
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