A total dose of four units of botulinum toxin A was injected into the right levator labii superior muscle, two units into the right levator anguli oris muscle, two units into the left depressor anguli oris muscle, and two units into the right inferior orbicularis oris
A double lip presents as a double vermilion with a transverse furrow between the two borders which appear when the orbicularis oris
muscle contracts during a smile.
Physical examination also revealed bilateral weakness of the facial muscles including orbicularis oris
, orbicularis oculi, frontalis, and corrugator supercilii.
Oral examination revealed an extensive ulcer, although flat and with no signs of orbicularis oris
muscle infiltration (Fig.
There are important findings in a recent report supporting the concept that principal factor that causes maxillary retrusion in cases with unilateral cleft is lip repair (Specifically the orbicularis oris
muscle) rather than palate repair.
The oral cavity constitutes a complex morphofunctional system in which the peri oral muscles mainly the orbicularis oris
and buccinators exert inward force balanced by the outward forces exerted by tongue.
These researchers instructed their test subjects to view cartoons while holding a pen in their mouth in such a way that either the zygomaticus major muscle (which is used when laughing and smiling) or its antagonist, the orbicularis oris
muscle, was contracted.
We carry this incision down to the orbicularis oris
Using the second part of the coil to form the upper part of the mouth, the orbicularis oris
, we get the 'Homer Simpson' look (Fig 3).
The act of kissing generally uses one muscle, called the orbicularis oris
, that is responsible for puckering your lips when you kiss.
Istemsiz kasilmalar orbicularis oculi, frontalis, zygomaticus major, zygomaticus minor, levator labi superioris, risorius, orbicularis oris
, mentalis ve platysma kaslarinda gozlenebilir (6,8).
In the opinion of Linder-Aronson  (1974), the need to keep the lips open to breathe in mouth breathers would lead to a change in the tension of the orbicularis oris