Muscles for Facial Expressions Flashcards
Occipitofrontalis - frontal belly
O: epicranial aponeurosis
I: skin superior to supraorbital margin
A: draws scalp anteriorly, raises eyebrows, wrinkles forehead
N: CNVII - facial
Occipitofrontalis - occiptal belly
O: occipital bone and mastoid process of temporal bone
I: epicranial aponeurosis
A: draws scalp posteriorly
N: CNVII - facial
Orbicularis oris
O: muscle fibers around opening of mouth
I: skin at corner of mouth
A: closes and protrudes lips (kiss), compress lips against teeth, shape lips for speech
N: CNVII - facial
Zygomaticus major
O: zygomatic bone
I: skin at angle of mouth and orbicularis oris
A: draws angle of mouth superior and laterally (smile)
N: CNVII - facial
Zygomaticus minor
O: zygomatic bone
I: upper lip
A: raises upper lip, exposing maxillary (upper) teeth
N: CNVII - facial
Levator labii superioris
O: superior to infraorbital foramen of maxilla
I: skin of angle of mouth and orbicularis oris
A: raises upper lip
N: CNVII - facial
Depressor labii inferioris
O: mandible
I: skin of lower lip
A: depress lower lip
N: CNVII - facial
Depressor anguli oris
O: mandible
I: angle of mouth
A: draws angle of mouth laterally and inferiorly (opening mouth)
N: CNVII - facial
Levator anguli oris
O: inferior to infraorbital foramen
I: skin of lower lip and orbicularis oris
A: draws angle of mouth laterally and superiory
N: CNVII - facial
Buccinator
O: alveolar processes of maxilla and mandible and pterygomandibular raphe
I: orbicularis oris
A: presses cheeks against teeth and lips (whistling, blowing, sucking), draws corner of mouth laterally, assist in chewing
N: CNVII - facial
Risorius
O: fascia over parotid gland
I: skin at angle of mouth
A: draws angle of mouth laterally (grimacing)
N: CNVII - facial
Mentalis
O: mandible
I: skin of chin
A: elevates and protrudes lower lip and pulls skin of chin up (pout)
N: CNVII - facial
Platysma
O: fascia over deltoid and pectoralis muscles
I: mandible, blends with muscles around angle of mouth and skin of lower face
A: draws outer lower lip inferiorly and posteriorly (pout), depresses mandible
N: CNVII - facial
Orbicularis oculi
O: medial wall of orbit
I: circular path around orbit
A: closes eye
N: CNVII - facial
Corrugator supercilii
O: medial end of superciliary arch of frontal bone
I: skin of eyebrow
A: draws eyebrow inferiorly and wrinkles skin of forehead vertically (frowning)
N: CNVII - facial
