risorius

(noun)

This muscle pulls the mouth back mimicking a smile, but does not affect the skin around the smile.

Related Terms

  • Orbicularis Oculi
  • Corrugator Supercilii
  • Orbicularis Oris
  • Nasalis
  • Procerus
  • Buccinator
  • levator labii superioris alaeque nasi
  • mentalis
  • depressor anguli oris
  • levator labii superiori
  • depressor labii inferioris
  • zygomatic
  • buccinator
  • orbicularis oris
  • occipofrontalis muscle

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.
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