Muscle Actions

Question 1

Sternocleidomastoid

Answer 1

Unilaterally: Tilt head sideways, rotate face
Bilaterally: Extend head, flex cervical vertebrae

Question 2

Platysma

Answer 2

Draw mouth inferiorally

Draws skin of the neck superiorally

Question 3

Mylohyoid

Answer 3

Elevates hyoid during swallowing and speech

Question 4

Geniohyoid

Answer 4

Widens pharynx, shortens floor of the mouth

Question 5

Stylohyoid

Answer 5

Elevate and retract the hyoid, elongates floor of the mouth

Question 6

Digastric Anterior and Posterior

Answer 6

Depress mandible, elevate and steady the hyoid

Question 7

Sternohyoid

Answer 7

Depress hyoid during swallowing

Question 8

Omohyoid

Answer 8

Depress and tract the hyoid

Question 9

Sternohyoid

Answer 9

Depress hyoid and larynx

Question 10

Thryohyoid

Answer 10

Depress hyoid, elevate larynx

Question 11

Anterior scalene

Answer 11

Flex neck laterally, elevate rib 1

Question 12

Middle scalene

Answer 12

Flex neck laterally, elevate rib 1

Question 13

Posterior scalene

Answer 13

Flex neck laterally, elevate rib 2

Question 14

Temporalis

Answer 14

Elevate and retract mandible

Question 15

Masseter

Answer 15

Elevate and protract mandible

Question 16

Lateral pterygoid

Answer 16

depress and protract mandible; lateral displacement

Question 17

Medial pterygoid

Answer 17

elevate and protract mandible

Question 18

Orbicularis oculi

Answer 18

close eyelid

Question 19

orbicularis oris

Answer 19

close mouth, pucker lips

Question 20

buccinator

Answer 20

press cheek against the teeth, draws lips back

Question 21

zygomaticus major

Answer 21

draws angle of the mouth upward and laterally

Question 22

frontalis

Answer 22

elevate the eyebrow

Question 23

levator palpebrae superioris

Answer 23

elevate the superior eyelid

Question 24

superior rectus

Answer 24

elevate, adduct, rotate eye medially

Question 25

lateral rectus

Answer 25

abduct eye

Question 26

inferior rectus

Answer 26

depress, adduct, and rotate eye laterally

Question 27

medial rectus

Answer 27

adduct eye

Question 28

superior oblique

Answer 28

abduct, depress, rotate eye medially

Question 29

inferior oblique

Answer 29

abduct, elevate, rotate eye laterally

Question 30

stylopharyngeus

Answer 30

elevate pharynx and larynx for speech and swallowing

Question 31

levator veli palatini

Answer 31

elevate palate during swallowing and yawning

Question 32

tensor veli palatini

Answer 32

tense palate and opens Eustachian tube during swallowing and yawning

Question 33

genioglossus

Answer 33

depress tongue, protude tongue; unilaterally wags tongue

Question 34

styloglossus

Answer 34

retrude tongue, curls sides

Question 35

hyoglossus

Answer 35

depress tongue, retrude tongue

Question 36

cricothyroid

Answer 36

stretch and tense vocal ligaments

Question 37

arytenoid

Answer 37

adduct arytenoid cartilages

Question 38

posterior crico-arytenoid

Answer 38

abduct vocal folds

Question 39

thyroarytenoid

Answer 39

relax vocal ligament