That looks pretty high to me too, but its a hard picture to look at.. wierd angle too..

And for MNPURPLE "There is that fairly wide area behind the shoulder blade where there would be some room between the actual spine and the cavity"...

There is NO void between the spine and the cavity there.. what the heck , are we looking at two different pictures...

http://home.mn.rr.com/deerfever/Anatomy.html