FACS – cheat sheet

GIF-based FACS guide with isolated action units (AUs), proper FACS nomenclature, & corresponding muscle labels.

*See AU 11 & AU 23 for rare reference shots of nasolabial furrow deepener & lip tightener.

eyebrows & forehead

AU1 – inner brow raiser 

frontalis, pars medialis

AU1 - inner brow raiser GIF

for a deeper dive on AU1:

  • The Secret Life of Inner Brow Raiser
    • This post and video will walk you through the variations in inner brow raiser and how to identify each person’s unique inner brow raising style – including your own! 
    • (If you are not a subscriber, the free version of this video is on YouTube) 
  • Inner Brow Raiser Deep Dive
    • This  post covers fundamental features of inner brow raiser.
    • It also goes over common misconceptions regarding inner brow raiser and how to recognize incorrect inner brow raiser references. (Spoiler alert: There are a lot of them.)
  • Frontalis Variation
    • This  post covers under-researched topics in frontalis muscle structure. 
    • It covers anatomical differences of the frontalis muscle and how these differences look as well as what implications they may have in the areas of:
      • face tracking
      • mocap
      • EMG recording
      • FACS-based facial coding
  • Compare AU1 to a full brow raise (1+2). Observe image below.

    AU1 - inner brow raiser vs. full brow raise static image

AU2 – outer brow raiser 

frontalis, pars lateralis

AU2 - outer brow raiser static image

AU2 - outer brow raiser - frontalis, pars lateralis GIF


for a deeper dive on AU2:

  • In the context of AU1 vs. AU2:  The Secret Life of Inner Brow Raiser (If you are not a subscriber, the free version of this video is on YouTube)
    • While this post and video is primarily focused on AU1 (inner brow raiser), there is valuable information on AU2 here as well.
  • Frontalis Variation
    • This  post covers under-researched topics in frontalis muscle structure. 
    • It covers anatomical differences of the frontalis muscle and how these differences look as well as what implications they may have in the areas of:
      • face tracking
      • mocap
      • EMG recording
      • FACS-based facial coding
  • Compare AU2 to a full brow raise (1+2). Observe image below.
    AU2 vs. AU1+2 image

AU4 – brow lowerer 

corrugator supercilii, depressor glabellae,  depressor supercilii

AU4 - brow lowerer - before and after

AU4 - brow lowerer - GIF


for a deeper dive on AU4:

    • The 3 muscles that make up AU4 can move independently.

1. corrugator

        • tends to push the brows toward each other
        • can be referred to as “knitting” the brows
        • causes vertical wrinkles above the nose

2. depressor glabellae

        • technically considered a nasal muscle
        • tends to push the down the medial portion of the brows, above the nose
        • causes horizontal wrinkle above nasal root

3. depressor supercilii

        • technically considered an eye muscle
        • debated whether this muscle is its own distinct muscle or part of orbicularis oculi

          ***Many surgeons, dermatologists, ophthalmologists, and plastic surgeons argue strongly that depressor supercilii is a distinct muscle with its own movement. I’m with them on this one. I believe I have identified depressor supercilii action occurring in isolation (or near isolation); however, I was not able to find any depressor supercilii references to compare to. I am happy to hear feedback from anatomists and surgeons. See GIF below.

        • depressor supercilii
        • depressor supercilii
      •  

      GIFs     

AU1 – inner brow raiser 

AU1 - inner brow raiser GIF

AU2 – outer brow raiser 

AU2 - outer brow raiser - frontalis, pars lateralis GIF


AU4 – brow lowerer 

AU4 - brow lowerer - GIF

*  *  *

      still images     

AU2 - outer brow raiser static image

AU4 - brow lowerer - before and after

eyes & cheeks

AU5 – upper lid raiser 

levator palpebrae superioris

AU5 - upper lid raiser GIFAU 5 - GIF

AU6 – cheek raiser 

orbicularis oculi, pars orbitalis

for a deeper dive on AU6:

AU7 – lid tightener

orbicularis oculi, pars palpebralis

AU7 - lid tightener GIF

for a deeper dive on AU7:

AU5 – upper lid raiser 

AU 5 - GIF

AU6 – cheek raiser 

AU7 – lid tightener 

AU7 - lid tightener GIF

Screen Shot 2020-04-22 at 1.13.54 PM
Eyebrow combination references HERE.
Screen Shot 2020-04-22 at 1.09.59 PMMore upper face references HERE.

 

AU Description Facial
Muscle(s)
Example
GIFs
 

For AUs 1-7, see tabs above

This FACS cheat sheet is under construction.

For old FACS Cheat Sheet, click here

9 nose wrinkler levator labii superioris, alaeque
nasi
AU9 - nose wrinkler
10 upper lip raiser levator labii superioris, caput infraorbitalis
11 nasolabial furrow deepener zygomaticus minor AU11
12 lip corner puller zygomaticus major
13 sharp lip puller levator anguli oris
(aka caninus)
AU 13 action
14 dimpler buccinator AU 14 movement
15 lip corner depressor depressor anguli oris (aka
triangularis)
AU 15 - lip corner depressor
16 lower lip depressor depressor labii inferioris AU16 - lower lip depressor
17 chin raiser mentalis AU17 - chin raiser
18 lip pucker incisivii labii superioris and
incisivii labii inferioris
AU18 - lip pucker
20 lip stretcher risorius w/ platysma AU20 - lip stretcher
22 funneler orbicularis oris AU22 - funneler
23 lip tightener orbicularis oris AU23 - lip tightener
24 lip presser orbicularis oris AU24 - lip presser
25 lips part depressor labii inferioris
or relaxation of mentalis, or orbicularis oris
AU25 - lips parted
26 jaw drop masseter, relaxed temporalis
and internal pterygoid relaxed
AU26 - jaw drop
27 mouth stretch pterygoids, digastric AU27 - mouth stretch
28 lip suck orbicularis oris AU28 - lips suck
43 eyes closed relaxation of levator
palpebrae superioris; orbicularis oculi, pars palpebralis
AU43 - eye closure 
45 blink relaxation of levator -palpebrae superioris; orbicularis oculi, pars palpebralis blink
46 wink relaxation of levator
palpebrae superioris; orbicularis oculi, pars palpebralis
wink

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