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Facial Muscles
Risorius/Platysma Risorius originates over rear of jaw, inserts into mouth corner; platysma originates on upper chest, inserts into mouth corner. Both act together, stretching mouth, as in crying. Known as the lip stretcher.
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Facial Muscles
Risorius/Platysma Risorius originates over rear of jaw, inserts into mouth corner; platysma originates on upper chest, inserts into mouth corner. Both act together, stretching mouth, as in crying. Known as the lip stretcher.
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