In case you've come across this (above) graphic anywhere on the Internet and freaked out because you didn't/did have that muscle, then calm down!

This 'missing muscle' phenomenon is a part of a 'Proof of Evolution' video shared by Vox, highlighting the changes our bodies have gone through because of evolution.

It's pretty incredible and oddly fascinating, take a look:

Advertisement - Continue Reading Below

Amazing, right?

What do you think?