Inner Brow Raiser
Frontalis, pars medialis
Outer Brow Raiser
Frontalis, pars lateralis
Brow Lowerer
Corrugator supercilii, Depressor supercilii
Upper Lid Raiser
Levator palpebrae superioris
Cheek Raiser
Orbicularis oculi, pars orbitalis
Lid Tightener
Orbicularis oculi, pars palpebralis
Nose Wrinkler
Levator labii superioris alaquae nasi
Upper Lip Raiser
Levator labii superioris
Nasolabial Deepener
Zygomaticus minor
Lip Corner Puller
Zygomaticus major
Cheek Puffer
Levator anguli oris (a.k.a. Caninus)
Dimpler
Buccinator
Lip Corner Depressor
Depressor anguli oris (a.k.a. Triangularis)
Lower Lip Depressor
Depressor labii inferioris
Chin Raiser
Mentalis
Lip Puckerer
Incisivii labii superioris and Incisivii labii inferioris
Lip stretcher
Risorius w/ platysma
Lip Funneler
Orbicularis oris
Lip Tightener
Orbicularis oris
Lip Pressor
Orbicularis oris
Lips part**
Depressor labii inferioris or relaxation of Mentalis, or Orbicularis oris
Jaw Drop
Masseter, relaxed Temporalis and internal Pterygoid
Mouth Stretch
Pterygoids, Digastric
Lip Suck
Orbicularis oris
Lid droop**
Relaxation of Levator palpebrae superioris
Slit
Orbicularis oculi
Eyes Closed
Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis
Squint
Orbicularis oculi, pars palpebralis
Blink
Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis
Wink
Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis
Head turn left
Head turn right
Head up
Head down
Head tilt left
Head tilt right
Head forward
Head back
Eyes turn left
Eyes turn right
Eyes up
Eyes down
* AUs (Action Units) underlined bold are currently recognizable by AFA System when occurring alone or cooccurring.
** The criteria has changed for this AU, that is, AU 25, 26 and 27 are now coded according to criteria of intensity (25A-E) and also AU 41, 42 and 43 are now coded according to criteria of intensity