5C

• Orbital group:

  • obicularis oculi (2) - CLOSES EYE (orbital forcefully/palpebral gently)
  • corrugator supercilii - DEEP to obicularis oculi, draws eyelids ot midline -> vertical wrinkle above nose
• Nasal group: SUP. TO INF.

  • Procerus - draws eyebrows down --> transverse wrinkles over nose
  • Nasalis (2)- transverse: compresses nares + alar: flares nares
  • Depressor septi nasi - widens the nares
• Oral group: facial expression

  • obicularis oris - purses mouth (whistling)
  • buccinator - cheek, forces air expanding the cheek out of the mouth
• Buccinator

  Lower fibers enter lower lip and upper fibers enter upper lip.

  FALSE. Lower fibers enter upper lip and upper fibers enter lower lip.
• Oral group lower: facial expression

  • depressor anguli oris - depresses corner of mouth during frowning
  • depressor labii inferioris - depresses lower lip and moves it laterally
  • mentalis - positions the lip during drinking and pouting + wrinkles the skin of the chin
• oral group upper: facial expression

  • risorius - helps to produce smile :0) and pulls corner of mouth laterally and upward
  • zygomaticus major and minor - helps produce smile :0) and raises corner of mouth and move it laterally
• oral group upper: facial expression

  • levator labii superioris - deepens furrow bwn nose and corner of mouth when :0(
  • levator labii superioris alaeque nasi - lifts the lip up and flares the nares
  • levator anguli oris - deep to other levators and zygomaticus, deepens furrow bwn nose and corner of mouth when :0(
• muscles of facial expression: auricular group

  • ANT.
  • SUP.
  • POST. --> auricular
  • ALL move ear/wiggles ears
• facial muscles that don't fit in the groups:

  • platysma - large superior sheet of muscle in neck, tenses skin in neck and moves corners of mouth down
  • occipitofrontalis - moves the scalp, wrink forehead and raises eyebrows (frontal and occipital bellies + aponeurotic layer)