Muscles of Facial Expression Flashcards
Frontalis
O: Galea aponeurotica
I: Subcutaneous tissue of eyebrows
A: Elevates eyebrows; draws scalp forward; wrinkles skin of forehead
N: Facial
Occipitalis
O: Superior nuchal line and temporal bone
I: Galea aponeurotica
A: Retracts scalp; fixes galea aponeurotica so frontalis can act on eyebrows
N: Facial
Orbicularis Oculi
O: Lacrimal bone; adjacent regions regions of frontal bone and maxilla; medial angle of eyelids
I: Upper and lower eyelids; skin around margin of orbit
A: Sphincter of eyelids; closes eye in blinking, squinting, and sleep; aids in flow of tears across eye
N: Facial
Levator Palpebrae Superioris
O: Lesser wing of sphenoid in posterior wall of orbit
I: Upper eyelid
A: Elevates upper eyelid; opens eye
N: Oculomotor
Corrugator Supercilii
O: Medial end of supraorbital margin
I: Skin of eyebrow
A: Draws eyebrows medially and downward in frowning and concentration; reduces glare of bright sunlight
N: Facial
Nasalis
O: Maxilla just lateral to nose
I: Bridge and alar cartilages of nose
A: Widens nostrils; narrows internal air passage between vestibule and nasal cavity
N: Facial
Orbicularis Oris
O: Modiolus of mouth
I: Submucosa and dermis of lips
A: Encircles mouth, closes lips, protrudes lips in kissing; uniquely developed in humans for speech
N: Facial
Levator Labii Superioris
O: Zygomatic bone and maxilla near inferior margin of orbit
I: Muscles of upper lip
A: Elevates and everts upper lip in sad, sneering, or serious expressions
N: Facial
Levator Anguli Oris
O: Maxilla just below infraorbital foramen
I: Muscles at angle of mouth
A: Elevates angle of mouth as in smiling
N: Facial
Zygomaticus Major
O: Zygomatic bone
I: Superolateral angle of mouth
A: Draws angle of mouth upward and laterally in laughing
N: Facial
Zygomaticus Minor
O: Zygomatic bone
I: Muscles of upper lip
A: Elevates upper lip, exposes upper teeth in smiling or sneering
N: Facial
Risorius
O: Zygomatic arch; fascia near ear
I: Modiolus
A: Draws angle of mouth laterally in expressions of laughing, horror, or disdain
N: Facial
Depressor Anguli Oris
O: Inferior margin of mandibular body
I: Modiolus
A: Draws angle of mouth laterally and downward in opening mouth or sad expressions
N: Facial
Depressor Labii Inferioris
O: Mandible near mental protuberance
I: Skin and mucosa of lower lip
A: Draws lower lip downward and laterally in chewing and expressions of melancholy or doubt
N: Facial
Mentalis
O: Mandible near inferior incisors
I: Skin of chin at mental protuberance
A: Elevates and protrudes lower lip in drinking, pouting, and expressions of doubt or disdain; elevates and wrinkles skin of chin
N: Facial
