Muscles of Facial Expressions Flashcards
Frontalis
O : Galea Aponeurotica
I : Fascia and skin overlying the frontal bone
A : Draws scalp posteriorly (Elevation of the eyebrows)
Occipitalis
O : Lateral 2/3 of the highest nuchal line of the occipital bone and the mastoid area of the temporal bone
I ; Galea Aponeurotica
A : Draws scalp posteriorly
Orbicularis Oculi
O : Medial side of the eye
I : Medial side of the eye
A : Closes and squints the eye
Levator Palpebrae Superioris
O : Anterior surface of the lesser wing of the sphenoid
I : Fascia and skin of the upper eyelid
A : Elevates the upper eyelid
Corrugator Supercilli
O : Medial end of the superciliary arch of the frontal bone
I : Fascia and skin superior to the eyebrow
A : Draws the eyebrow inferomedially
Procerus
O : Fascia and skin over the nasal bone
I : Fascia and skin medial to the eyebrows
A : Draws down medial angle of eyebrows, produces transverse wrinkles over the bridge of the nose
Nasalis
O : Maxilla
I ; Cartilage of the nose
A : Draws ala of nose towards septum
Depressor Septi Nasi
O : Incisive fossa of the maxilla
I : Septum and alar cartilage of the nose
A : Constricts the nostril
Levator Labii Superioris Alaeque Nasi
O : Frontal process of the maxilla near the nasal bone
I : Muscular substance of the upper lip
A : Elevates the nasal ala (flaring the nostril), elevates the upper lip
Levator Labii Superioris
O : Inferior orbital margin of the maxilla
I : Muscular substance of the upper lip
A : Elevates the upper lip
Zygomaticus Minor
O : Zygomatic bone near zygomaticomaxillary suture
I : Muscular substance of the upper lip
A : Elevates the upper lip
Zygomaticus Major
O ; Zygomatic bone near the zygomaticotemporal suture
I : Modiolus, just lateral to the corner of the mouth
A : Elevates the angle of the mouth
Levator Anguli Oris
O : Canine fossa of the maxilla (just inferior to the infraorbital foramen)
I : Modiolus, just lateral to the angle of the mouth
A : Elevates the angle of the mouth
Risorius
O : Fascia and skin superficial to the masseter
I : Modiolus, just lateral to the angle of the mouth
A : Draws the angle of the mouth laterally
Depressor Anguli Oris
O : Oblique line of mandible, inferior the mental foramen
I : Modiolus, lateral to the angle of the mouth
A : Depress the angle of the mouth
Depressor Labii Inferioris
O : Oblique line of the mandible, between the symphysis menti and the mental foramen
I : Midline of the lower lip
A : Depresses the lower lip
Mentalis
O : Incisive fossa of the mandible
I : Fascia and skin of the chin
A : Elevates the lower lip and everts and protracts the lower lip
Buccinator
O : External surfaces of the alveolar process of the mandible and the maxilla and the pterygomandibular raphe
I : Deep to the modiolus, just lateral to the angle of the mouth
A : Compress the cheek against teeth
Orbicularis Oris
O + I : 4 quadrants, upper and lower on right and left anochring to the modiolus, attaching to itself
A : Closes mouth and protracts the lips
Platysma
O : Fascia covering superior part of pectoralis major and deltoid
I : Base of mandible, skin and fascia of lower part of the face
A : Assist to depress mandible, tighten fascia of the neck and draw down the corner of the mouth
