Muscles of Facial Expression Flashcards
Frontal Belly of occipitofrontalis
O: epicranial aponeurosis
I: skin of forehead
A: elevates eyebrows and forehead; wrinkles forehead
I: CN VII
Orbicularis oculi
O: medial orbital margin, medial palpebral ligament, and lacrimal bone
I: skin around the margin of the orbital, tarsal plate, eyelids
A: closes the eyelids, orbital part forcefully and palpebral part for blinking
I: CN VII
Nasalis
O: superior part of the canine ridge of the maxilla
I: nasal cartilage
A: draws the ala of nose towards septum to compress opening
I: CN VII
Levator labii superioris
O: frontal process of the maxilla and infraorbital region
I: skin of the upper lip and alar cartilage
A: elevates lips, dilates nostril, raises angle of mouth
I: CN VII
Orbicularis oris
O: median plane of maxilla superiorly and mandible inferiorly; others from deep skin
I: mucous membrane of lips
A: closes and protrudes lips (whistles)
I: CN VII
Platysma
O: skin, superficial fascia of superior deltoid and pectoral regions
I: mandible, skin of cheek, angle of mouth, and orbicularis oris
A: tenses skin of lower face
I: CN VII
Mentalis
O: incisive fossa of mandible
I: skin of cheek
A: elevates and protrudes lower lip and wrinkles chin
I: CN VII
Buccinator
O: mandible, pterygomandibular raphe, and alveolae processes of maxilla and mandible
I: angle of mouth
A: presses cheek against molar teeth (aides in chewing and expels air between lips)
I: CN VII
