Muscles: Facial Expression Flashcards
Galea Aponeurotica
aka epicranial aponeurosis
Occipitofrontalis
frontal belly
- raises eyebrows, wrinkles forehead
Occipitofrontalis
- occipital belly
- draws back scalp
What is the cut and reflected muscle shown here?
Temporoparietalis
COURSE:
- galea aponeurotica > auricular cartilage
ACTION:
- assists frontal belly of occipitofrontalis
- tenses temporal fascia
- assists auricular muscles
What is the highlighted muscle?
Its 3 parts?
Orbicularis Oculi
PARTS:
- orbital (surrounding eyelid)
- palpebral (eyelid)
- lacrimal (AKA Horner’s) (deep, medial, crossed fibers attached to posterior lacrimal crest)
COURSE:
- orbital: circularly around eye, attached to palebral ligament medially
- palpebral: circularly on eyelid, attached to palp. lig.
- lacrimal: post. lacrimal crest > orbital and palpebral parts
ACTION:
- closes eyelids
Corrugator Supercilii
COURSE:
- glabella + supraorbital margin > eyebrow skin
(penetrates orb. oculi and occ.frontalis)
ACTION:
- wrinkles forehead
9
Procerus
COURSE:
- fascia over nose > skin just above glabella
ACTION:
- frowning (draws down medial angle of eyebrow)
10 and 11
two parts of one muscle
Nasalis
-
transverse (compressor naris) - compresses nostrils
* above/lateral to incisive fossa > aponeurosis on bridge of nose -
alar (dilator nasalis) - dilates nostrils
* maxilla over lateral incisor > greater alar cartilage
12
Levator Labii Superioris Alaeque Nasi
COURSE:
- nasal bone > nostril and upper lip
ACTION:
- dilate nostril
- elevate upper lip and wing of nose
1
orbicularis oris
- not a simple sphincter, has multiple parts with fibers in different directions
COURSE:
- maxilla & mandible > skin around the lips
ACTION:
- closes mouth and puckers lips
2
buccinator
COURSE:
- molar alveolar processes & pterygomandibular raphe (3) > angle of mouth
(forms lateral wall of oral vestibule)
ACTION:
- compresses cheeks against teeth
- assists mastication and suckling (neonates)
- blowing, laughing, crying, expresses satisfaction
4
Zygomaticus Major
COURSE:
- anterior zygomatic > modiolus (chiasma of mouth muscles at corners of mouth)
ACTION:
- draws angle of mouth up and lateral
- laughter/pleasure
5
zygomaticus minor
COURSE:
- zygomatic > nasolabial groove
ACTION:
- elevates upper lip
6
risorius
COURSE:
- masseteric fascia > angle of mouth (modiolus)
ACTION:
- draws angle of mouth back
- laughing, expression of “action”
- AKA laughing muscles
7
levator labii superioris
COURSE:
- infraorbital margin > skin of upper lip
ACTION:
- elevates upper lip
8
Levator Anguli Oris
COURSE:
- maxilla (below inf.orb. foramen) > modiolus
ACTION:
- elevates angle of mouth
- smile, self-confidence
9
depressor anguli oris
COURSE:
- tubercle of mandible > modiolus
ACTION:
- depresses angle of mouth
- frowning, sadness
10
depressor labii inferioris
COURSE:
- oblique line of mandible > skin of lower lip, orb. oris fibers
ACTION:
- depresses lower lip
- expression of perseverance
11 (bottom)
mentalis
COURSE:
- alveolar jugum > chin (mental tubercle)
ACTION:
- elevates chin, wrinkles skin
- protrudes lower lip
- expression of doubt and indecision
12
platysma
COURSE:
- skin of neck (supra/infraclavicular regions) > facial region (cheek, mandible, modiolus, orb. oris)
ACTION:
- draws corners of mouth down, widens mouth
- expressions of fright or sadness
