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Muscles of Facial Expression & Muscles of Mastication – Tongue MUSCLES PART A2 groups-muscles of facial expression & muscles of mastication/tongue Muscles of facial expression-insert into skin, nonverbal communication, innervated by cranial nerve 7 (facial nerve)SCALP-epicranius (occipitofrontalis) has bipartite muscle with galea aponeurotica and a frontal/occipital bellyFACE-corrugator supercili zymomatius, risorius, levator labii superior, depressor labii inferior,.