There is not a list for us to look at and answer your question
Is there a story along with this? We need a story to do something.
Either way, my guess is that they see themselves in it.
There are three pairs known as temporalis, masseter, pytergoid. They work together to move the mandible at the temporomandibular joint. these three muscles are responsible for the chewing action, grinding the teeth, moving our mandible side to side and also assisting us to speak
An exaggeration
By using the all cap the author successfully exaggerated their point.
