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obicularis oris is a shincter of the mouth. what are its actions? what are its anagonists 10?
• This muscle is a sphincter of the mouth, it acts to narrow the mouth and close the lips
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Antagonists of orbicularis oris are dilators of the mouth in various directions – these are:
• Levator labii superioris alaeque nasi
• Levator labii superioris
• Zygomaticus minor
• Zygomaticus major
• Levator anguli oris
• Risorius
• Depressor anguli oris
• Depressor labi inferioris
• Mentalis
Buccinator
