Superficial Face Flashcards
buccinator innervation
facial nerve CN VII
buccinator action
presses cheek against molar teeth
works with tongue to keep food between occlusal surfaces and out of oral vestibule
resists distension (when blowing)
orbicularis oculi innervation
facial nerve CN VII
orbicualris oculi action
closes eyelids
orbicularis oris innervaiton
facial nerve CN VII
orbicualris oris action
tonus closes mouth
phasic contraction compresses and protrudes lips (kissing)
resists distension (when blowing)
masseter O
inferior border and medial surface of maxiallry process of zygomatic bone and the zygomatic arch
masseter i
angle and lateral surface of ramus of mandible
masseter innervation
anterior trunk of mandibular nerve CN V3 - via masseteric nerve
masseter action
elevates mandile
superficial fibers make limited contribution to protrusion of mandible
temporalis O
broad attachment to floor of temporal fossa and deep surface of temporalis fascia
temporalis I
narrow attachment to tip and medial surface of coronoid process
anterior border of ramus of mandible
temporalis innervation
anterior trunk of mandibular nerve CN V3 via deep termporal nerve
temporalis action
elevates mandible, closing jaws
posterior mor horizontal fibers are retractors of mandible
medial ptrerygoid O
quadrangular two headed muscle
- medial surface of lateral pterygoid plate and pyramidal process of palatine bone
- tuberosity of maxilla
medial pterygoid I
medial surface of ramus of mandible
inferior to mandibular foramen
medial pterygoig innervation
anterior trunk of mandibular nerve CN V3, via nerve to medial pterygoid
medial pterygoid action
acts synergistically with masseter to elevate mandible
contributes to protrusion
alternate unilateral activity produces smaller grinding movements
lateral pretygoid O
twiangular two headed muscle
- infratemporal surface of crest of greater wing of sphenoid
- lateral surface of lateral pterygoid plate
lateral pterygoid I
superior head attaches primarily to joint capsule and articualr disc of TMJ
inferior head attaches primarily to pterygoid fovea on anteromedial aspect of neck of condyloid process of mandible
lateral pterygoid innervation
anterior trunk of mandibular nerve CN V3 via nerves to lateral pterygoid
lateral pterygoid action
acting bilaterally: protracts mandible and depreses chin
unilaterally: swings jaw towards contralateral side, alternate unilateral contraction produces larger lateral chewing movements
Occipital frontalis action and innervation
Elevates eyebrows / wrinkles skin of forehead
Innervated by facial nerve
