Muscles of Mastication, Face, Jaw And Eye (Nerves And Actions)

Question 1

Masseter

Answer 1

N: Trigeminal n (C-V) (mandibular division)

A: Elevates the mandible (slight protraction)

Question 2

Temporalis

Answer 2

N: Trigeminal n (C-V) (mandibular division)

A: Elevates and retractsmandible, assists in ipsilateral deviation

Question 3

Medial Pterygoid

Answer 3

N: Trigeminal n (C-V) (mandibular division)

A: Elevates and protracts mandible, contralateral deviation

Question 4

Lateral Pterygoid

Answer 4

N: Trigeminal n (C-V) (mandibular division)

A: Depresses and protracts mandible, contralateral deviation

Question 5

Frontalis

Answer 5

N: Facial n (C - VII) (temporal branch)

A: Draws scalp anteriorly, raises eyebrows and wrinkles skin of forehead horizontally

Question 6

Corrugator Supercilii

Answer 6

N: Facial n (C - VII) (temporal branch)

A: Draws eyebrows inferiormedial causing vertical wrinkles in forehead

Question 6

Occipitalis

Answer 6

N: Facial n (C - VII) (post auricular branch)

A: Draws scalp posteriorly and assists in
wrinkling forehead

Question 7

Orbicularis Oculi

Answer 7

N: Facial n (C - VII) (temporal & zygomatic branches)

A: Closes eyelids

Question 7

Auriculares

Answer 7

N: Facial n (C - VII) (post auricular branch)

A: Superior - elevates pinna of ear
Anterior - draws pinna of ear anteriorly
Posterior - draws pinna of ear posteriorly

Question 8

Procerus

Answer 8

N: Facial n (C - VII) (buccal branch)

A: Draws medial angle of eyebrow inferior and pulls skin of nose superior

Question 9

Levator Palpebrae Superioris

Answer 9

N: Oculomotor n (C - III)

A: Elevates upper eyelid

Question 10

Nasalis

Answer 10

N: Facial n (C - VII) (buccal branch)

A: Depresses nasal cartilage and flares nostrils

Question 11

Levator Labii Superioris

Answer 11

N: Facial n (C - VII) (buccal branch)

A: Elevates upper lip

Question 12

Levator Labii Superioris Alaeque Nasi

Answer 12

N: Facial n (C - VII) (buccal branch)

A: Elevates upper lip

Question 13

Zygomaticus Minor

Answer 13

N: Facial n (C - VII) (buccal branch)

A: Elevates upper lip

Question 14

Zygomaticus Major

Answer 14

N: Facial n (C - VII) (buccal branch)

A: Elevates and pulls angle of mouth laterally

Question 15

Orbicularis Oris

Answer 15

N: Facial n (C - VII) (buccal & mandibular branches)

A: Closes, compresses, protrudes, and shapes lips

Question 16

Risorius

Answer 16

N: Facial n (C - VII) (buccal branch)

A: Draws angle of mouth laterally

Question 17

Buccinator

Answer 17

N: Facial n (C - VII) (buccal branch)

A: Compresses cheek

Question 18

Depressor Anguli Oris

Answer 18

N: Facial n (C - VII) (mandibular branch)

A: Draws corners of mouth inferiorly

Question 19

Depressor Labii Inferioris

Answer 19

N: Facial n (C - VII) (mandibular branch)

A: Depresses lower lip

Question 20

Mentalis

Answer 20

N: Facial n (C - VII) (mandibular branch)

A: Elevates and protrudes lower lip

Question 21

Platysma

Answer 21

N: Facial n (C - VII) (cervical)

A: Depresses lower jaw and lip, tenses and ridges skin of neck

Question 22

Superior Rectus

Answer 22

N: Oculomotor nerve (C-III)

A: Raises the cornea superomedial

Question 23

Inferior Rectus

Answer 23

N: Oculomotor nerve (C-III)

A: Depresses cornea inferomedial

Question 24

Medial Rectus

Answer 24

N: Oculomotor nerve (C-III)

A: Rotates cornea medially

Question 25

Lateral Rectus

Answer 25

N: Abducent nerve (C-VI)

A: Rotates cornea laterally

Question 26

Inferior Oblique

Answer 26

N: Oculomotor nerve (C-III)

A: Rotates cornea superolateral

Question 26

Superior Oblique

Answer 26

N: Trochlear nerve (C-IV)

A: Rotates cornea inferolateral