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zygomaticus major

   Also found in: Wikipedia 0.01 sec.
zygomaticus major
[zī′gōmat′ikəs]
one of the 12 muscles of the mouth. Arising from the zygomatic bone and inserting into the corner of the mouth, it acts to draw the angle of the mouth up and back to smile or laugh. Also called zygomaticus. Compare zygomaticus minor.


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The researchers observed that the patients twitched their smiling-specific zygomaticus major muscle when presented with happy pictures, and the frowning-specific corrugator supercilii muscle when presented with fearful pictures.
The toxin is typically injected into the zygomaticus major and minor, the levator anguli oris, and the risorius.
 
 
 
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