Muscles Of Facial Expression - Bio 20 Reedley College

Front 1

Frontalis

Back 1

Orgin: Galea aponeurotica
Insertion: skin superior to supraorbital margin
Action: draws scalp anteriorly elevates eyebrows, wrinkles skin of forehead horizontally

Front 2

Occipitalis

Back 2

Orgin: occipital bone and mastoid process of temporal bon
Insertion:Galea aponeurotica
Action: Draws scal posteriorly

Front 3

Orbicularis Oris

Back 3

Orgin: muscle fibers surrounding opening of mouth
Insertion: Sikin at the corner of mouth
Action: Closes lips, compresses lips against teeth, protrudes lips, shapes lips during speech

Front 4

Levator Labii Superioris

Back 4

Orgin: Superior to infraorbital foramen of maxilla
Insertion: Skin at angle of mouth and orbicularis oris
Action: Elevates upper lip

Front 5

Depressor Labii Inferioris

Back 5

Orgin: Mandible
Insertion: Skin of lower lip
Action: Depresses lower lip

Front 6

Buccinator

Back 6

Orgin: Alveolar processes of maxilla and mandible and pterygomandibular raphe
Insertion: Orbicularis oris
Action: Compresses cheek, produces the action of sucking, causes cheek to cave in

Front 7

Platysma

Back 7

Orgin: Fascia over deltoid and pectoralis major
Insertion: Mandible, muscles around angle of mouth, skin of lower face
Action: Draws outer part of lower lip inferiorly as in pouting, depresses mandible

Front 8

Orbicularis Oculi

Back 8

Orgin: Medial wall of orbit
Insertion: Circular path around orbit
Action: Closes eye.