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The Orbicularis Oris is a muscle of facial expression of the mouth. The muscles of facial expression of the mouth are:
- Levator Labii Superioris Alaeque Nasi (also a muscle of fascial expression of the nose)
- Levator Labii Superioris
- Zygomaticus Minor
- Zygomaticus Major
- Levator Anguli Oris
- Depressor Anguli Oris
- Depressor Labii Inferioris
- Orbicularis Oris
- The orbicularis oris encircles the mouth.
- Closes the mouth.
- Protracts (protrudes) the lips.
- There are two orbicularis oris muscles. The two orbicularis oris muscles on the left and right sides of the body blend into each muscle at the midline.
- The orbicularis oris puckers the lips, so it is often referred to as the kissing muscle.
- The orbicularis oris is also functionally important for whistling.