Anantomy

In: Science

Submitted By snp00
Words 629
Pages 3
Head 2

Muscles of Facial Expression






Lie in the subcutaneous tissue of
the face.
All innervated by the terminal
motor branches of the facial
nerve (CN VII)
Take origin from the underlying
facial skeleton, but insert into the
skin or facial cartilages

Muscles of Facial Expression


Can be divided by region:







Scalp
Nose
Mouth
Eye
Neck

Scalp



Epicranius
Composed of an epicranial
aponeurosis and the
occipitofrontalis muscle


Frontal belly of
occipitofrontalis






O: Frontal bone
I: Epicranial aponeurosis
Moves scalp, eyebrows;
wrinkles skin of forehead

Occipital belly of
occipitofrontalis




O: Superior nuchal line
I: Epicranial aponeurosis
Retracts scalp

Nose


Nasalis






O: Maxillae and alar
cartilage of nose
I: Dorsum of nose
Compresses bridge and
depresses tip of nose;
elevates corners of
nostrils

Procerus





O: Nasal bone and lateral
nasal cartilage
I: Aponeurosis at bridge
of nose and skin of
forehead
Moves and wrinkles nose

Mouth


Buccinator








Compresses cheek;
holds food between
teeth during chewing
O: Alveolar processes of
mandible and maxillae
I: Orbicularis oris

Depressor anguli oris





Draws corners of mouth
inferiorly and laterally
(“frown” muscle)
O: Body of mandible
I: Skin at inferior corner
(angle) of mouth

Mouth


Depressor labii
inferioris






Draws lower lip
inferiorly
O: Body of mandible
lateral to midline
I: Skin at inferior lip

Levator anguli oris





Draws corners of
mouth superiorly and
laterally (“smile”
muscle)
O: Lateral maxilla
I: Skin at superior
corner of mouth

Mouth


Levator labii
superioris







Opens lips; raises and
furrows the upper lip
(“Elvis” lip…...

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