In archery, it is important to keep your shoulders in line. In picture A, the individual would have a difficult time aiming because they are using their muscles to hold the bow. I realize that you use muscles to hold the bow, but in picture B, the individual is using the bones in their arm to hold the pressure of the bow, allowing for a steadier aim.
The brachioradialis is a pear/tear shape which goes from the lateral part of the bicep (away from body) to the thumb). In conjunction with the other palm side muscle group (consisting of several muscle segments) and the bicep we see an intersection of three interlocking main shapes. Note the white areas showing the tendons (attaching muscle to bone)
The two shoulders are located beneath the head connecting the arm and the chest. Each shoulder consists of 2 bones, the clavicle and the scapula, and collectively both shoulders account for 4 bones in the body. http://www.learnbones.com/shoulder-bones-anatomy/
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