Muscle Locations and Actions

  Muscles of Facial Expression

Muscle:  Frontalis

Expression:  Surprise

Location:  The forehead

Action:  Raises the eyebrows causing wrinkling across the forehead

 

Muscle:  Corrugator

Expression:  Frowning

Location:  Between eyebrows

Action:  Draws eyebrows down and together

 

Muscle:  Procerus

Expression:  Distaste

Location:  Covers upper bridge of nose

Action:  Draws eyebrows down and wrinkles skin over lower bridge of nose

 

Muscle: Orbicularis oculi

Expression: Winking

Location: Surrounds the eyes

Action: Closes the eyelid

 

nasalis

 

 

Muscle: Nasalis

Expression: Anger

Location: Covers front of nose and surrounds nostrils

Action: Opens and closes nasal openings (flares nostrils)

 

 

Muscle: Levator labii

Expression: Distaste

Location: Surrounds the upper lip

Action: Raises and draws back the upper lips and nostrils

 

depressor_labii_inferioris_atlas

 

Muscle: Depressor labii

Expression:  Sulking

Location: Surrounds the lower lip

Action: Pulls down the lower lip and draws it slightly to the side

 

 musculus_orbicularis_oris_atlas

 

Muscle: Orbicularis oris

Expression: Pout, kiss, doubt

Location: Surrounds the whole mouth

Action: Purses the lip (like blowing), closes the mouth

 

 triangularis

 

Muscle: Triangularis

Expression: Sadness

Location: Corner of lower lip extends over chin

Action: Pulls down the corners of the mouth

 

musculus_mentalis_atlas

 

Muscle: Mentalis

Expression: Doubt

Location: Covers the front of the chin

Action: Lifts the lower lip causing the chin to wrinkle

 

 platysma

 

Muscle: Platysma

Expression: Fear, horror

Location: Sides of the neck and under the chin

Action: Pulls the mouth corners downwards and backwards

 

Muscles of Mastication (chewing)

 

 masseter

 

Muscle: Masseter

Location: Cheek: From zygomatic bone to mandible

Action: Clenches teeth, raises lower jaw and closes mouth

 

temporalis

 

Muscle: Temporalis

Location: Covers the sides of the scalp temple region to the mandible

Action: Raises jaw and draws it backwards = chewing

 

Muscles that Move the Head

 sternocleidomastoid

Muscle: Sternocleidomastoid

Location: From sternum to clavicle bone and temporal bone

Action: Flexes neck, rotates and bows the head

 

trapezius

 

Muscle: Trapezius

Location: Large diamond/kite-shaped muscle covering the back of the neck and upper back (also an upper body muscle)

Action: Pulls head backward and allows shoulder movement

 

 occipitalis

 

Muscle: Occipitalis

Location: Covers the back of the head

Action: Draws scalp backward

 

 Muscles of the Chest, Arm and Hand

 

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