facial muscles

Facial Muscles

TriangularisPosition-Corner of the lower

lip, extends over the chin

Action -Pulls the corners of

the chin down

Expression

TemporalisPosition- Runs down the side

of the face towards the upper jaw

Action - Aids raising and

lowering the jaw when chewing

FrontalisPosition- Upper part of the

cranium-forehead

Action - Moves the scalp

forward and raises eyebrows - surprise

Expression

ZygomaticusPosition- Runs down the

cheek towards the corner of the mouth

Action Pulls the corner of

the mouth upwards and sideways as in smiling Expressi

on

CorrugatorPositionMedial end of the

eyebrow

ActionDraws the eyebrows

down and together as in frowning

Expression

Orbicularis occuliPositionSphincter muscle

surrounding the eye orbit.

ActionOpen and close the

eye as in winking and blinking

Expression

Orbicularis OrisPositionA sphincter muscle

surrounding the mouth

ActionCloses and opens

the mouth

Expression

BuccinatorPositionRun through the

angle of the cheek to the corners of the mouth

ActionCompresses food in

the cheeks when eating and allows the blowing action

Expression

RisoriusPositionCorners of the

mouth above the Buccinator muscle

ActionPulls the corner of

the mouth upwards and sideways as in grinning

Expression

MasseterPositionRun down the face to

the angle of the jaw

ActionLifts, lowers and

closes the jaw aiding mastication by exerting pressure on teeth Expression

Depressor labii inferiorePositionUnderside of the

lower lip, either side of the mentalis muscle

ActionTo depress the lower

lip

Expression

PlatysmaPositionFront and side of the

neck, down to the clavicle

ActionDepresses lower jaw

and lip wrinkling skin tissue on neck

MentalisPositionAttached to the

lower jaw and the lower lip at the point of the chin

ActionLifts and wrinkles

the chin turns lower lip outwards as in pouting

Expression

NasalisPositionOver the front of the

nose

ActionCompresses and

dilates the nostril openings causing wrinkling

Expression

ProcerusPositionTop of the nose

between the eyebrows

ActionDepresses the

eyebrows and forms wrinkles over the bridge of the nose

Quadratus labii SuperiorePositionRuns upwards from

upper lip in four separate groups

ActionLifts the upper lip

and helps open the mouth

Sternocleido MastoidPositionEither side of the neck

to sternum and clavicle

ActionIndividually rotates the

head to one side, pulls head down to shoulder and together pulls the chin onto the chest

Pectoralis majorPosition Front of the chest, under the breast.

Action Pulls the arm forward and assists with rotation

DeltoidPositionCaps the shoulder

Action Raises the arm to the side,Pulls it back and forward again

Occipitalis

PositionAt the back of the skull

ActionHelps with movement of the head

TrapeziusPositionUpper back and sides of neck

ActionRotation of shoulders, draws back scapula ie, braces shoulders, pull head back