Lab 2 - Actions

Question 1

frontalis belly, epicranius

Answer 1

• pulls scalp forward
• wrinkles foreheard
• raises eyebrows

Question 2

occipitalis belly, epicranius

Answer 2

pulls scalp backward

Question 3

procerus

Answer 3

depress eyebrows medially

Question 4

compressor naris

Answer 4

compress cartilage at bridge of nose

Question 5

dilatator naris

Answer 5

widens, dilates nostrils and anterior nasal aperture

Question 6

depressor septi

Answer 6

widens nostril

Question 7

corrugator supercilii

Answer 7

draws eyebrow medial and down (forms vertical furrow between eyebrows)

Question 8

levator labii superioris

Answer 8

raises and everts upper lip

Question 9

levator labii superioris alaeque nasi

Answer 9

• raises and everts upper lip

- dilates nostril

Question 10

zygomaticus minor

Answer 10

• raises upper lip

- produces nasolabial groove

Question 11

zygomaticus major

Answer 11

draws angle of mouth up and out

Question 12

levator anguli oris

Answer 12

• raises angle of mouth

- produces nasolabial groove

Question 13

orbicularis oris

Answer 13

• close mouth

- purse and protrude lips

Question 14

buccinator

Answer 14

compress cheeks against teeth

Question 15

risorius

Answer 15

draws back angle of mouth

Question 16

mentalis

Answer 16

raises and protrudes lower lip

Question 17

depressor labii inferioris

Answer 17

draws lower lip down

Question 18

depressor anguli oris

Answer 18

draws corner of mouth down and out

Question 19

levator palpebra superioris

Answer 19

elevates upper eyelid

Question 20

superior rectus

Answer 20

• elevate and adduct the cornea

- intorsion

Question 21

inferior rectus

Answer 21

• depress and adduct the cornea

- extorsion

Question 22

medial rectus

Answer 22

adducts cornea

Question 23

lateral rectus

Answer 23

abducts cornea

Question 24

superior oblique

Answer 24

• depresses and abduct the cornea

- intorsion

Question 25

inferior oblique

Answer 25

• elevate and abduct the cornea

- extorsion

Question 26

temporalis

Answer 26

elevate and retract mandible

Question 27

masseter

Answer 27

elevate and protract mandible

Question 28

medial pterygoid

Answer 28

• elevate and protract mandible

- assists in gliding or rotatory movement

Question 29

lateral pterygoid

Answer 29

• protracts mandible
• pulls disc forward
• depress chin
• assist in gliding or rotatory movement