risorius

Examples of risorius in the following topics:

• Facial Muscles

  • The risorius muscle is lateral to the orbicularis oris and inserts into the angle of the mouth.
  • When innervated, the risorius pulls the mouth back mimicking a smile, but does not affect the skin around the smile As a result, this facial expression is often interpreted as insincere.

• The Facial Feedback Hypothesis

  • To this end, participants held a pen in their mouth in one of three ways: the Lip position would contract the orbicularis oris muscle, resulting in a frown; the Teeth position would contract the zygomaticus major or the risorius muscle, resulting in a smile; and the control group would hold the pen in their non-dominant hand.