Muscle Actions Flashcards
Sternocleidomastoid
Unilaterally: Tilt head sideways, rotate face
Bilaterally: Extend head, flex cervical vertebrae
Platysma
Draw mouth inferiorally
Draws skin of the neck superiorally
Mylohyoid
Elevates hyoid during swallowing and speech
Geniohyoid
Widens pharynx, shortens floor of the mouth
Stylohyoid
Elevate and retract the hyoid, elongates floor of the mouth
Digastric Anterior and Posterior
Depress mandible, elevate and steady the hyoid
Sternohyoid
Depress hyoid during swallowing
Omohyoid
Depress and tract the hyoid
Sternohyoid
Depress hyoid and larynx
Thryohyoid
Depress hyoid, elevate larynx
Anterior scalene
Flex neck laterally, elevate rib 1
Middle scalene
Flex neck laterally, elevate rib 1
Posterior scalene
Flex neck laterally, elevate rib 2
Temporalis
Elevate and retract mandible
Masseter
Elevate and protract mandible
Lateral pterygoid
depress and protract mandible; lateral displacement
Medial pterygoid
elevate and protract mandible
Orbicularis oculi
close eyelid
orbicularis oris
close mouth, pucker lips
buccinator
press cheek against the teeth, draws lips back
zygomaticus major
draws angle of the mouth upward and laterally
frontalis
elevate the eyebrow
levator palpebrae superioris
elevate the superior eyelid
superior rectus
elevate, adduct, rotate eye medially
lateral rectus
abduct eye
inferior rectus
depress, adduct, and rotate eye laterally
medial rectus
adduct eye
superior oblique
abduct, depress, rotate eye medially
inferior oblique
abduct, elevate, rotate eye laterally
stylopharyngeus
elevate pharynx and larynx for speech and swallowing
levator veli palatini
elevate palate during swallowing and yawning
tensor veli palatini
tense palate and opens Eustachian tube during swallowing and yawning
genioglossus
depress tongue, protude tongue; unilaterally wags tongue
styloglossus
retrude tongue, curls sides
hyoglossus
depress tongue, retrude tongue
cricothyroid
stretch and tense vocal ligaments
arytenoid
adduct arytenoid cartilages
posterior crico-arytenoid
abduct vocal folds
thyroarytenoid
relax vocal ligament