I am reviewing bones and their muscles, and how to use them in ballroom and Latin dancing.

Arm to hand:

Upper arm - humerus bone (one bone) with three major muscles -- biceps, deltoid and triceps. Biceps flexes the arm like a flower closing. Triceps extends the arm  like a flower opening. Deltoid moves the arm to the side like a bird's wing. 

Lower arm - radius and ulna (two bones) with two major muscles -- pronator teres and pronator quadratus. Both muscles pronate (turns the hand palm down) ...
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