3.4 Muscles of Facial Expression

Question 1

Raises eyebrows and wrinkles forehead

Answer 1

frontalis m.

Question 2

retracts scalp

Answer 2

occipitals m.

Question 3

Closes eyelids

Answer 3

orbicularis oculi

Question 4

Pulls eyebrows medially and inferiorly; creates horizontal wrinkle across bridge of nose

Answer 4

procerus

Question 5

Pulls eyebrows medially; creases multiple vertical wrinkles along medial aspects of supra-orbital margin

Answer 5

Corrugator supercilli m.

Question 6

Flares nostrils

Answer 6

nasalis m.

Question 7

closes mouth, compresses lips against teeth and produces protrusion of kips (kissing)

Answer 7

orbicularis oris

Question 8

elevates corner of the mouth (bilaterally = smiling, unilaterally = sneering); dilates mouth

Answer 8

zygomaticus major

Question 9

Dilates mouth and raises upper lip

Answer 9

zygomaticus minor

Question 10

dilates mouth and lifts the angle of the mouth

Answer 10

levator anguli oris

Question 11

retracts (elevate) upper lip; dilates mouth

Answer 11

levator labii superioris

Question 12

Pulls angles of mouth inferiorly

Answer 12

depressor angel oris

Question 13

depresses lower lip

Answer 13

depressor labi inferioris

Question 14

Elevates and protrudes lower lip (pouting)

Answer 14

mentalis

Question 15

What is the origin of the buccinator muscle?

Answer 15

pterygomandibular raphe

Question 16

Presses check against teeth (keeps food between occlusal surfaces of teeth), resists forces when blowing, whistling, or sucking

Answer 16

buccinator

Question 17

depresses mandible (against resistance), tenses skin over neck and lower face

Answer 17

platysma

Question 18

What gives sensory innervation to the face and scalp?

Answer 18

• Cervical Plexus
• CN V

Question 19

What gives motor innervation to the face and scalp?

Answer 19

CN VII

Question 20

What gives sensory innervation to the skin over parotid region, and parotid sheath?

Answer 20

Great auricular n. (branches from cervical plexus)

Question 21

What gives sensory innervation to the scalp posterior to auricle?

Answer 21

Lesser occipital n. (branches from the cervical plexus)

Question 22

What gives sensory innervation to the post. ramus of C2, and the scalp over the occipital region?

Answer 22

Greater occipital n. (branch of the cervical plexus)

Question 23

What gives sensory innervation to the lateral forehead?

Answer 23

Supra-orbital n.

• Branches from CN V1, off of frontal n. in orbit

Question 24

What gives sensory innervation to the medial forehead?

Answer 24

Supratrochlear n.

• Branches from CN V1, off of frontal n. in orbit

Question 25

What supplies sensory innervation to: * Skin over medial cheek * Lateral nose * Upper lip * Inferior eyelid

Answer 25

Infra-orbital n. * Branches from CN V2, through infra-orbital foramen

Question 26

What supplies sensory innervation to the skin over the prominence of the cheek?

Answer 26

Zygomaticofacial n. * Branch of CN V2, off of the zygomatic n.

Question 27

What supplies sensory innervation to the skin anterior to temporal fossa?

Answer 27

Zygomaticotemporal n. * Branch of CN V2, from zygomatic n.

Question 28

What supplies sensory innervation to the skin anterior to auricle and posterior 2/3 of temporal region?

Answer 28

Auriculotemporal n. * Branch from CN V3 * Travels posterior to neck of mandible to then emerge and travel with superficial temporal vessels

Question 29

What supplies sensory innervation to the skin and oral mucosa of cheek, and buccal gingiva of mandibular molars?

Answer 29

(Long) buccal n. * Branch of CN V3

Question 30

What supplies sensory innervation to the skin and oral mucosa of lower lip?

Answer 30

Mental n. * Branch of CN V3 * Emerges via mental foramen

Question 31

Where does CN VII emerge from and what are the fibers?

Answer 31

Stylomastoid foramen Somatic motor and somatic sensory fibers only

Question 32

What does CN VII pass through and break up into its 5 terminal branches?

Answer 32

Parotid Gland

Question 33

What structures travel within the Parotid Gland?

Answer 33

* CN VII *does not innervate it* * External Carotid Artery * Retromandibular Vein

Question 34

The parotid duct exits anterior aspect of the gland ... to the zygomatic arch?

Answer 34

inferior

Question 35

The parotid duct passes superficial to the ...

Answer 35

masseter muscle

Question 36

What muscle does the parotid duct pierce?

Answer 36

buccinator

Question 37

Where does the parotid duct open?

Answer 37

opposite 2nd maxillary molar

Question 38

What gives parasympathetic innervation to the parotid gland?

Answer 38

CN IX - lesser petrosal n.

Question 39

Where do the preganglionic parasympathetic fibers of the lesser petrosal n. (CN IX) synapse?

Answer 39

Otic Ganglion

Question 40

The postganglionic fibers of the lesser petrosal n. (CN IX) hitch a ride on what nerve?

Answer 40

Auriculotemporal n. (CN V3)

Question 41

The post-ganglionic sympatic fibers that innervate the Parotid Gland travel as a plexus on branches of ...

Answer 41

ECA

Question 42

What gives innervation to the parotid sheath?

Answer 42

Great auricular n.