These are the muscles in your face that are involved in expressing emotion. They are involved in everything from smiling to scowling and everything in between.
Not sorted alphabetically, but rather roughly from the top to the bottom of your face.
... someday, someday, Everything will allow pictures ... then, it all will become clear. Until then, I will not even attempt to ASCIIart this.
/msg me for errors/omissions/additions/whatever.