Articulatory System: Lip Muscles

Question 1

Basic speech muscles

Answer 1

Ring group: Orbicularis oris
Transverse group: Buccinator, Risorius

Question 2

Facial expression muscles

Answer 2

Angular:
Zygomatic major
Zygomatic minor
Levator labii superior
Depressor labii inferior

Vertical:
Levator anguli oris
Depressor anguli oris
Mentalis

Parallel:
Incisivus labii superior
Incisivus labii inferior

Neck:
Platysma

Question 3

Oribularis oris Attachments

Answer 3

Maxilla
Mandible

Intrinsic ring encircles lip
Extrinsic ring converges from orbicularis oris to other lip muscles

Question 4

Orbicularis oris Functions

Answer 4

Lip rounder /u/
Lip purser /m/
Lip compressor /p/

Question 5

Buccinator Attachments

Answer 5

Pterygomandibular ligament
OO

Question 6

Buccinator Functions

Answer 6

Compress lips against teeth or spread lips
/m/ or /p/
Dimple mouth corner

Question 7

Risorius Attachments

Answer 7

Masseter fascia
Corner of OO

Question 8

Risorius Functions

Answer 8

Spread lips sideways
/i/

Question 9

Zygomatic major Attachments

Answer 9

Zygomatic bone
Corner of OO

Question 10

Zygomatic major Function

Answer 10

Draws corner of lips upwards and to the side
“Smile”

Question 11

Zygomatic minor Attachments

Answer 11

Zygomatic bone
Upper OO lateral to midline

Question 12

Zygomatic minor Functions

Answer 12

Draws lips upward and to side
“Smile”

Question 13

Levator labii superior Attachments

Answer 13

Maxilla bone
Upper OO lateral to midline

Question 14

Levator labii superior Functions

Answer 14

Lifts upper lip only
“Sneer”

Question 15

Depressor labii inferior Attachments

Answer 15

Mandible
Blends into lower OO lateral to midline

Question 16

Depressor labii inferior Functions

Answer 16

Pulls lower lip downward
“Duh face”

Question 17

Levator anguli oris Attachments

Answer 17

Maxilla
Corner of OO, both upper and lower

Question 18

Levator anguli oris Functions

Answer 18

Pulls corner of mouth upward
“Smile”
Close mouth by drawing lower lip up

Question 19

Depressor anguli oris Attachments

Answer 19

Mandible
Corner of OO, mostly upper OO

Question 20

Depressor anguli oris Functions

Answer 20

Pulls corner of lip downward
“Frown”

Question 21

Mentalis Attachments

Answer 21

Mandible
Midline of lower OO

Question 22

Mentalis Functions

Answer 22

Outward curling of lower lip
“Pout”

May contribute to labiodentals

Question 23

Incisivus labii superior/inferior Attachments

Answer 23

Maxilla/mandible
Merge with OO on opposite corner

Question 24

Incisivus labii superior/inferior Functions

Answer 24

Pulls corner of lips toward center
“Kiss”

Question 25

Platysma Attachments

Answer 25

Fascia covering pectoralis major and deltoid Mandible Blends into corner of OO

Question 26

Platysma Functions

Answer 26

Draws lip corner to side and downward "Grimace"