They attach to facial skin. On contraction they change the shape of the mouth, eyes, or nose, etc.

Superficial facial muscles

They attach to bone. They enable movements such as chewing and large movements of the face.

Deep facial muscles

It receives information from the face and controls the superficial facial muscles.

Facial nerve (VII)

Its main function is to receives information from the face and controls jaw musculature.
"large three part nerve in your head that provides sensation" (Trigeminal Neuralgia - Symptoms and Causes - Mayo Clinic, 2022)
It is one of the largest cranial nerves and it is made up of the opthalmic, maxillary, and mandibular nerves

Trigeminal nerve (V)

It suggests that sensory feedback from our facial expressions can affect our mood.

Facial feedback hypothesis

- Chronic inhibition of the facial musculature (symptom of Parkinson's disease, schizophrenia)
- Viral infection, cause paralysis of facial muscles (Bell's palsy)

Impaired facial expression

- Two categories of facial muscles
- Two cranial nerves
- Facial feedback hypothesis
- Impaired facial expression

University of Michigan - Ann Arbor

- Examining the kinds of emotions by examining different kinds of facial expressions

How many emotions do we experience

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

The scheme suggests that there are 8 basic emotions, grouped in four pairs of opposites:

- joy/sadness
- affection/disgust
- anger/fear
- expectation/surprise

However, investigators do not yet agree with this number.

One popular scheme of basic emotions

- Cross-cultural similarity and cultural differences in facial expressions
- Facial expression is paralinguistic

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