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Just like the bones in the hand, the arms bones are also very flexible. The arm is made up of three bones. These are the ulna, radius, and humerus. In the humerus, there is a deep groove near the top that holds the biceps in place.
The lower bones are connected with the humerus at the elbow and with the carpal bones at the wrist. As the arm turns, so do the bones in the lower arm. There is a membrane between the two bones. The elbow allows the arm to bend and straighten.
At the shoulder are two bones that form the shoulder joint. These are the clavical (collar bone) and the scapul (shoulder blade). This is a ball and socket joint. This joint allows the arm to move in circles.
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