You are right, it is not above the lungs and below the spine, it is above the lungs and ABOVE the spine! The spine does not run directly on the top of the back. Check the skeleton pic, and note how the spine dips below the shoulder bone and dips towards the neck bones. I know you see the white void area on the circulatory pic. That 2 - 3 inch area is NO MANS LAND. Believe me, it exists, if you don't believe the pics, do an autopsy on the next deer you harvest.

http://www.whitetailfanatic.com/html/rc_wds_anatomy.shtml