Muscles of Facial Expression Flashcards
Muscle of facial expression blood supply
Usually facial artery
What cranial nerve is the facial nerve?
Cranial nerve 7
Are the muscles of facial expression paired or not paired?
Paired
Facial expressions usually work together
Epicranius frontal belly
Origin-
Insertion-
Origin-Epicracial aponeurosis
Insertion- eyebrow and root of nose
Epicranius occipital belly
origin-
insertion-
Origin-Occipital and temporal bones
Insertion-epicranial aponeurosis
Epicranius action
Raises eyebrows and scalp
Surprised look
Orbicularis oculi orbital portion
Origin
Insertion
Origin-orbital rim
Insertion- skin lateral to eye
Orbicularis oculi palpebral portion
Origin-
Insertion-
Origin-medial and lateral corners of eye
Insertion-shared with origin
Orbicularis oculi
Action
Closes the eye, Squinting, eyelid, working more of orbital
Circles the eyes
Orbicularis oculi
Eye optic
Makes up our eyebrow muscles
Corrugator
Corrugator supercilii
Origin
Insertion
Origin-frontal bone
Insertion-skin lateral to eyebrow
Corrugator supercilii action
Moves skin of eyebrow medial and inferior, vertical wrinkles on forehead, lowers eyebrow.
*furrows the brow
Procerus
Origin-
Insertion-
Origin- nasal bone
Insertion- skin of forehead
Procerus action
Horizontal wrinkles between the eyebrows, wrinkles in between eyebrows
Levator labii superioris alaque nasi
Action-
“Elevate lip upper angle nose”
Flaring of nostrils(nares), raise upper lip and angle of nose
Lavator labii superioris alaque nasi
Origin-
Insertion-
Origin-frontal process of maxilla
Insertion-skin at ala of nose, upper lip
Levator labii superioris
Origin-
Insertion-
Origin-infraorbital rim
Insertion-skin of upper lip
Lavator labii superioris action
Elevates the upper lip
Zymomaticus major
Origin
Insertion
Origin- zygomatic bone
Insertion- skin at angle of mouth, corner of mouth
Zygomaticus major action
Pulls angle of mouth superiorly and laterly, pulls smile up and to side
zygomaticus minor
Origin
Insertion
O:just medial to zygomaticus major
I: skin of the upper lip, just lateral to levetor labii superioris
Zygomaticus minor action
Pulls angle of mouth superior (and lateral)
Smile muscle
Levator anguli oris
O:
I:
O: canine fossa of maxilla
I: skin at the angle of the mouth
Levator anguli oris
Action
Pulls angle of mouth superior and lateral
Cranial 7 and facial nerve
Deep muscle (under, behind)
Risorius
O:
I:
O: superficial fascia of masseter
I: skin at angle of mouth
Risorius action
Widens the mouth, pulls smile out
Cranial nerve 7, facial artery
Buccinator
3 origins
Fibrous-pterygoidansibular raphe (extends from hamulus and goes into myohyloid ridge)
2 bony- by cal alveolar bone, maxilla, and mandible (molar region)
Buccinator insertion
Skin at angle of mouth
Buccinator actions
Pulls angle of mouth laterally, shortens cheek vertically, shortens cheek horizontally, puffs out cheeks
Ex: blow up balloons play instrument
What muscle is an accessory muscle of mastication and helps keep food on teeth
Buccinator
Orbicularis oris
O and I:
Skin surrounding the mouth, some insertions at philtrum and angle of mouth.
Philtrum-area below nasal septum
Orbicularis oris action
Closes the lips, puckers the lips
*muscle around mouth
Depressor anguli oris
Action
Depresses angle of mouth
Ex: frowning
Lower angle of mouth, bring down mouth, lower corners of mouth
Depressor anguli oris
O:
I:
O: lower border of mandible
I: skin at angle of mouth
Depressor labii inferioris action
Depress lower lip, exposes lower teeth,
Insertions go towards…
Origins
Mentalis
O:
I:
O: near midline of mandible
I: skin of chin
Mentalis action
Elevates skin at chin which will protrude lower lip, pushes out lower lip
Ex: pouting
2 small balls of muscle
Platysma
O:
I:
O: skin superficial to clavicle/shoulder
I: inferior border of mandible
Platysma action
Raises skin of neck and pulls down corners of mouth, neck tightens up
*very thin and superficial
All muscles of mastication and facial muscles use what nerve
Cranial nerve 7
