Muscles of facial expression: mouth

Question 1

Depressor anguli oris

Answer 1

O: oblique line of mandible
I: skin at corner of mouth
N: facial nerve
A: draws corner of mouth down and laterally

Question 2

Depressor labii inferioris

Answer 2

O: anterior oblique line of mandible
I: mid lower lip
N: Facial nerve
A: draw lower lip down and laterally

Question 3

mentalis

Answer 3

O: mandible inferior to incisors
I: Chin skin
N: facial
A: raise and protrude lower lip–wrinkle chin skin

Question 4

risorius

Answer 4

O: masseter fascia
I: corner of mouth
N: facial
A: retracts corner of mouth

Question 5

zygomaticus minor

Answer 5

O: Antero-lateral surface of zygomatic bone
I: upper lip medial to corner of mouth
N: Facial
A: draws upper lip up

Question 6

zygomaticus major

Answer 6

O: postero-lateral surface of zygomatic bone
I: corner of mouth
N: facial
A: draws corner of mouth up and lateral

Question 7

levator labii superiors

Answer 7

O: infra orbital margin of maxilla
I: lateral upper lip
N: facial
A: raises upper lip (forms nasolabial furrow)

Question 8

levator anguli oris

Answer 8

O: maxilla below infraorbital foramen
I: corner of mouth
N: Facial
A: raises corner of mouth (forms nasolabial furrow)

Question 9

orbicularis oris

Answer 9

O: maxilla and mandible in midline
I: ellipse around mouth
N: Facial
A: closes/protrudes lips

Question 10

buccinator

Answer 10

O: posterior mandible and maxilla
I: blends with oris and into lips
N: Facial
A: presses cheeks against teeth