muscles of facial expression

occipitofrontalis

long and wide muscle of the scalp

what muscles make up the epicranial group of the muscle of expression

occipitofrontalis & temporoparietalis

what is the thick fibrous sheath in the occipitofrontalis

epicranial aponeurosis (galea aponeurotica)

function of occipitofrontalis

elevate eyebrows

wrinkle forehead skin

orbit and eyebrow muscles

orbicularis oculi

corrugator supercilia (botox here will droop lid)

levator palpebrae superioris

origin and insertion of orbicularis oculi

O: medial wall of orbit

I: circular path around orbit

what nerve closes eye

orbicularis oculi

origin and insertion of corrugator supercilii

O: medial end superciliary arch of frontal bone

I: draws eyebrow inferior (frowning)

origin and insertion of levator palpebrae superioris

O: roof of orbit at LWS

I: skin of upper eyelid

which nerve elevates upper lid?

levator palpebrae superioris

nose muscles

-procerus

-nasalis

-depressor septi nasi

which nerve is the transverse muscle of the nose?

nasalis

located on bridge of the nose

which muscle flares the nostrils?

alar nasalis muscles

which muscle blends with procerus?

transverse nasalis

what is the origin and insertion of the transverse nasalis muscle?

O: maxilla

I: skin over the bridge of the nose @ the midline

origin and insertion of alar nasalis muscle

O: maxilla

I: alar cartilage of nostril and skin of nostrils

what is the function of the transverse nasalis muscle

compress the nostrils

which muscle draws eyebrows medially & wrinkles skin of the nose (frowning)

procerus

what is the primary function of the depressor septi nasi

pull nasal septum downward to widen nostrils

which nerve aids in respiratory functions by increasing airflow thru nasal passages

depressor septi nasi

origin and insertion of orbicularis oris

O: surrounds the mouth

I: skin at corner of mouth

which muscle do we use to kisssss?

orbicularis oris (protrudes lips)

also shapes lips during speech, close mouth, compresses lips against teeth

which muscle inserts @ angle of mouth & orbicularis oris & draws angle of mouth laterally (smiling)

zygomaticus major

which two muscles blend together and are the main elevators of the upper lid?

zygomaticus minor & levator labii superioris

which muscle depresses lower lip (sorrow, doubt & irony)

depressor labii inferioris

which muscle pulls corners of mouth downward

depressor anguli oris

which muscle elevates the angle of the mouth, showing the canines

levator anguli oris

which muscles are involved in smiling?

zygomaticus major

risorius

buccinator

what is the fleshy part of the cheek

buccinator

(forms a significant part of the lateral wall of the oral cavity)

which muscle elevates and protrudes lower lip. also pulls skin of chin up (doubt, pout, dislike)

mentalis

which muscle extends from the upper chest & shoulder area up to the lower jaw

platysma

functions of platysma

-tensing of skin of neck

-depressing mandible

-helps in movement of skin

muscles of mastication

-masseter

-temporalis

-medial pterygoid

-lateral pterygoid

what muscle originates at the zygomatic arch & inseerts at ramus of mandible. its function is to elevate & close the jaw - significant for biting & chewing

masseter

origin and insertion of temporalis

O: temporal fossa of the skull

I: coronoid process of the mandible

what is the function of the temporalis muscle

close the jaw with vertical and horizontal forces

which muscle is affected in pts with TMJ issues?

lateral pterygoid