This image shows differences in the position of the shoulder between chimpanzees (left) and humans (right). These differences can be seen in both the muscular anatomy and in the bony anatomy of the ... more 
This image shows differences in the position of the shoulder between chimpanzees (left) and humans (right). These differences can be seen in both the muscular anatomy and in the bony anatomy of the scapula (shoulder blade). less 
1 / 16
LiveScience.com | Photo By Brian Roach/Neil Roach
Wed, Jun 26, 2013 1:16 PM EDT