How many facial muscles do you use while yawning?

( i need a really good answer..thanks)How many facial muscles do you use while yawning?
Facial Muscles





We will now discuss the muscles of the face as indicated with their letter values in the following : fig


Here is an interactive chart of the muscles of the face (note: they differ slightly from the notes below): chart











JAW


A 鈥?Masseter 鈥?the clenching muscle.





- used to clench teeth and with lower jaw 鈥?fear, yawn.








MOUTH


B 鈥?Levator labii superioris 鈥?the sneering muscle.





- raises the upper lip beneath the nostrils 鈥?disgust, disdain.





C 鈥?Zygomnaticus major 鈥?the smiling muscle.





- raises the mouth upward and outward 鈥?smiling, laughing.





D 鈥?Triangularis 鈥?the facial shrug muscle.





- pulls the corner of the mouth downward 鈥?sadness, crying, miserable.





E 鈥?Depressor labii inferioris 鈥?the lower lip curl muscle.





- pulls the lower lip down and out 鈥?around the lips 鈥?surprise.





F 鈥?Mentalis 鈥?the pouting muscle.





- raises and tightens the chin - sadness, fear.





G 鈥?Orbicularis oris 鈥?the lip tightener muscle.





- compress and purses the lips 鈥?circles the mouth 鈥?disdain, repulsion.


EYE


H 鈥?Corrugator 鈥?the frown muscle.





- compresses the skin between the eyebrows 鈥?frown, concern, concentration.





I 鈥?Orbicularis oculi 鈥?the squinting muscle.





- closes the eyelids, compresses the eye opening, encircles the eye 鈥?close, wink, tired.





SCALP/NECK





J 鈥?Frontalis 鈥?the brow lifting muscle.





- draws the scalp down, wrinkles, two sides 鈥?fear, smile.





K 鈥?Risorius/platysma 鈥?the lower lip stretching muscle.





- draw the lower lip down and outward 鈥?neck muscle 鈥?crying, terrified.