Headphones On: Acnestis

I was reading how the Acnestis is the part of your back you can't reach and it made me wonder... did that "part" of the back get a name because you couldn't reach it or did it have a name and then someone realized that's where you couldn't reach unless you dislocated your shoulder?

Flight of the Conchords - Think About It, Think Think About It
From HBO's One Night Stand - 2005 Buy some: Flight of the Conchords