![AU2+4 frontalis, pars lateralis + [corrugator supercilii, depressor supercilii, depressor glabellae (aka procerus)]](https://i2.wp.com/melindaozel.com/wp-content/uploads/2020/07/2_4_combocrop.gif?ssl=1)
frontalis, pars lateralis + [corrugator supercilii, depressor supercilii, depressor glabellae (aka procerus)]
frontalis, pars lateralis + [corrugator supercilii, depressor supercilii, depressor glabellae (aka procerus)]
Facial Expressions in Art, Science, & Technology
frontalis, pars lateralis + [corrugator supercilii, depressor supercilii, depressor glabellae (aka procerus)]
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