Craniofacial and Extraocular Muscles

Question 1

Buccinator innervation

Answer 1

buccal branch of the facial nerve (CN VII)

Question 2

Buccinator function

Answer 2

compresses cheek (when blowing), presses cheeks against teeth when chewing

Question 3

Depressor anguli oris attachments

Answer 3

from mandible to angle of mouth (fibers run superior to inferior)

Question 4

Depressor anguli oris innervation

Answer 4

buccal and mandibular branch of the facial nerve (CN VII)

Question 5

Depressor anguli oris function:

Answer 5

depresses angle of mouth laterally (frown, sadness)

Question 6

Depressor labii inferioris attachments

Answer 6

from oblique line of mandible to the skin of the lower lip

Question 7

Depressor labii inferioris innervation

Answer 7

mandibular branch of the facial n.

Question 8

Depressor labii inferioris function:

Answer 8

depresses lower lip (pouting, sadness)

Question 9

occipitofrontalis muscle attachments:

Answer 9

from the superficial fascia of the eyebrows to the epicranial aponeurosis

Question 10

occipitofrontalis innervation:

Answer 10

temporal branch of the facial nerve

Question 11

occipitofrontalis function:

Answer 11

protracts the scalp or elevates eyebrows & nose (surprise or curiosity)

Question 12

Levator labii superioris attachments:

Answer 12

from the inferior orbital margin to the lateral aspect of the upper lip

Question 13

Levator labii superioris innervation:

Answer 13

buccal and zygomatic branches of the facial nerve

Question 14

Levator labii superioris function:

Answer 14

raises and everts the upper lip (showing sadness)

Question 15

Nasalis attachments:

Answer 15

from the maxilla lateral & inferior to the nasal notch to the bridge & ala of the nose

Question 16

Nasalis innervation:

Answer 16

buccal branch of the facial nerve

Question 17

Nasalis function:

Answer 17

transverse fibers compress & alar fibers widen the nasal aperture (flaring nostrils during anger or exertion)

Question 18

Orbicularis oculi attachments:

Answer 18

from orbital margin & medial palpebral lig. to superficial fascia of the eyelid

Question 19

Orbicularis oculi innervation:

Answer 19

temporal and zygomatic branches of the facial nerve

Question 20

Orbicularis oculi function:

Answer 20

a palpebral sphincter (closes eyes, winking)

Question 21

Orbicularis oris attachments:

Answer 21

from angle of mouth to the superficial fascia of the upper lip

Question 22

Orbicularis oris innervation

Answer 22

buccal & mandibular branches of the facial n.

Question 23

Orbicularis oris function:

Answer 23

an oral sphincter (closes mouth, kissing)

Question 24

Platysma attachments

Answer 24

from the lower border of the mandible to the superficial fascia of the skin of the neck overlying the clavicle

Question 25

Platysma innervation:

Answer 25

cervical branch of the facial n.

Question 26

Platysma function:

Answer 26

wrinkles the anterior nuchal skin (conveying tension or stress)

Question 27

Zygomaticus major attachments:

Answer 27

from zygomatic bone to angle of mouth

Question 28

Zygomaticus major innervation:

Answer 28

buccal and zygomatic branches of the facial nerve

Question 29

Zygomaticus major function:

Answer 29

raises the angle of the mouth (smiling, happiness)

Question 30

inferior oblique of the eyeball muscle innervation:

Answer 30

inferior ramus of the oculomotor n. (CN III)

Question 31

Inferior oblique of the eyeball muscle function:

Answer 31

elevation, abduction, and extorsion of the eye

Question 32

inferior rectus innervation:

Answer 32

inferior ramus of the oculomotor nerve (CN III)

Question 33

inferior rectus muscle function:

Answer 33

depression, adduction, and extorsion of the eye

Question 34

Levator palpebrae superioris innervation:

Answer 34

superior ramus of the oculomotor nerve (CN III)

Question 35

Levator palpebrae superioris function:

Answer 35

elevation of the upper lid

Question 36

Medial rectus innervation:

Answer 36

inferior ramus of the oculomotor nerve

Question 37

Medial rectus function:

Answer 37

adduction of the eye

Question 38

Superior rectus innervation:

Answer 38

superior ramus of the oculomotor nerve

Question 39

Superior rectus function:

Answer 39

elevation, adduction, and intorsion of the eye

Question 40

Lateral rectus muscle innervation:

Answer 40

abducens nerve

** ABDUCENS FOR ABDUCTION

Question 41

Lateral rectus muscle function:

Answer 41

ABDUCTION of the eye

Question 42

superior oblique muscle of the eye innervation:

Answer 42

trochlear nerve CN IV

** GOES AROUND THE TROCHLEA OF THE EYE

Question 43

superior oblique muscle of the eye function:

Answer 43

depression, abduction, and intorsion of the eye

Question 44

What is the trochlea of the eye?

Answer 44

The trochlea is a saddle-like cartilaginous structure in the superior and medial region of the orbita, which contains the tendon of the superior oblique muscle.

** ACTS AS A PULLEY FOR THE SUPERIOR OBLIQUE MUSCLE OF THE EYE