Muscle action Flashcards
Buccinator
compresses cheek
Depressor anguli oris
depresses buccal angle laterally
depressor labii inferioris
draws lower lip downward
frontalis
protracts the scalp or elevates eyebrows and nose
levator anguli oris
raises angle of mouth
levator labii superioris
raises and everts upper lip
mentalis
raises lower lip
nasalis
traverse fibers compress and alar fibers widen the nasal aperture
orbicularis oculi
palpebral (eyelids) sphincter
orbicularis oris
oral sphicter
platysma
wrinkles the anterior nuccal skin
zygomaticus major
raises buccal angle
Inferior oblique
EYE:
elevation
abduction
extorsion
Inferior rectus
EYE:
depression
adduction
extorsion
lateral rectus
Eye abduction
levator palpebrae superioris
elevation of upper lid
medial rectus
adduction of the eye
superior oblique
EYE
abduction
depression
intorsion
superior rectus
EYE
elevation
adduction
intorsion
massester
MANDIBLE
elevation
protraction
retraction (deep fibers)
temporalis
MANDIBLE
elevation
retraction (posterior aspect of muscle)
lateral pterygoid
MANDIBLE
protraction
acts with ipsilateral medial pterygoid to rotate the mandible to produce the side-to-side movements during chewing
medial pterygoid
MANDIBLE
elevation
acts with ipsilateral lateral pterygoid to rotate the mandible to produce the side-to-side movements during chewing
anterior digastric
depression of mandible
or
elevation of hyoid
posterior digastric
depression of mandible
or
elevation of hyoid
geniohyoid
elevation and anterior displacement of hyoid
or
depression of mandible with a fixed hyoid
longus capitis
flexion of head and neck
longus colli
flexion of neck