Facial Expression Muscles (lower 1/2)

Question 0

Zygomaticus major: origin

Answer 0

Zygomatic bone (lateral surface of posterior part)

Question 1

Zygomaticus major: action and insertion

Answer 1

Action: pull corner of mouth superiorly AND laterally (smile)

Insertion: skin at corner of mouth

Question 2

Zygomaticus minor: action and insertion

Answer 2

Action: pull upper lip superiorly

Insertion: upper lip medial to corner of mouth

Question 3

Zygomaticus minor: origin

Answer 3

Zygomatic bone (lateral surface of posterior part)

Question 4

Levator labii superioris alaeque nasi: action and insertion

Answer 4

Action: elevate upper lip, opens nostril

Insertion: alar cartilage of nose and upper lip

Question 5

Levator labii superioris alaeque nasi: origin

Answer 5

Maxilla bone (frontal process)

Question 6

Levator labii superioris: action and insertion

Answer 6

Action: elevate upper LIP and ANGLE of mouth, dilate nostril

Insertion: skin of upper lip, alar cartilage of nose

Question 7

Levator labii superioris: origin

Answer 7

Maxilla frontal process

Infraorbital region

Question 8

Depressor labii inferioris: action and insertion

Answer 8

Action: pulls lower LIP inferiorly and laterally (sad)

Insertion: lower lip at midline, blending with muscle from the opposite side

Question 9

Depressor labii inferioris: origin

Answer 9

Mandible (anterior portion of oblique line)

Question 10

Levator anguli oris: action and insertion

Answer 10

Action: pulls ANGLE of mouth inferiorly and laterally

Insertion: skin at corner of mouth

Question 11

Levator anguli oris: origin

Answer 11

Maxilla (below infraorbital foramen)

Question 12

Depressor anguli oris: action and insertion

Answer 12

Action: pulls ANGLE of mouth inferiorly and laterally

Insertion: skin of corner of mouth (blends with orbicularis oris)

Question 13

Depressor anguli oris: origin

Answer 13

Mandible (oblique line below canine, premolar, and first molar teeth)

Question 14

Buccinator: action and insertion

Answer 14

Action: press check against molars, helps tongue keep food out of oral vestibule, expels air from oral cavity/resists distension when blowing
Unilaterally draws mouth to one side

Insertion: angle of mouth, orbicularis oris

Question 15

Buccinator: origin

Answer 15

Mandible, alveolar processes of maxilla and mandible, pterygo-mandibular raphe

Question 16

Orbicularis oris: action and insertion

Answer 16

Action: oral sphincter, purses lips, resists distension when blowing

Insertion: mucous membrane of lips

Question 17

Orbicularis oris: origin

Answer 17

Deep surface of skin

• superiorly at maxilla median plane
• inferiorly at mandible

Question 18

Risorius: action and insertion

Answer 18

Action: retract corner of mouth (grimace)

Insertion: skin at corner of the mouth

Question 19

Risorius: origin

Answer 19

Fascia over masseter muscle

Question 20

Mentalis: action and insertion

Answer 20

Action: elevates and protrudes lower lip

Insertion: skin of chin

Question 21

Mentalis: origin

Answer 21

Mandible at incisive fossa

Question 22

Platysma: action and insertion

Answer 22

Action: wrinkles/depressed skin of lower face/mouth, tenses neck skin, helps forced depression of mandible

Insertion: skin of lower face, angle of mouth, inferior border of mandible

Question 23

Platysma: origin

Answer 23

Skin over lower neck and upper-lateral thoax