Unit 3: Muscle Innervations And Actions

Front 1

inferior oblique

Back 1

oculomotor/ CNIII
extorsion, elevation, abduction

Front 2

inferior rectus

Back 2

oculomotor/ CN III
depression and adduction

Front 3

lateral rectus

Back 3

Abducent VI
abducts eyeball

Front 4

levator palpebrae superioris

Back 4

oculomotor/CN III
opens eyelid

Front 5

medial rectus

Back 5

Oculomotor/ CN III
adducts eyeball

Front 6

Superior oblique

Back 6

Trochlear/ CN 4
intorsion, abducts and depresses eyeball

Front 7

Superior rectus

Back 7

Oculomotor/CN III
elevates eye, intorsion, medial rotation

Front 8

Buccinator

Back 8

Facial N/ CN VII
compresses cheeks

Front 9

Depressor anguli oris

Back 9

Facial n. mandibular branch
depresses angle of mouth

Front 10

Frontalis

Back 10

Facial n. / CN VII
raises eyebrow, wrinkes forehead

Front 11

levator labii

Back 11

facial n zygomatic branc/ CN VII
raises upper lip

Front 12

Orbicularis oculi

Back 12

Facial n. temporal and zyomatic branches/ CN VII
closes eyelids

Front 13

Orbicularis oris

Back 13

Facial n-buccal branch/ CN VII
pucker lips

Front 14

Platysma

Back 14

Facial n-cervical branch/ CNVII
draws down corners of mouth

Front 15

zygomaticus major

Back 15

Facial n. zygomatic branch CN VII
draws angle of mouth upward and laterally

Front 16

zygomaticus minor

Back 16

Facial buccal branch/ CN VII
elevates upper lip

Front 17

aternoid-transvers part

Back 17

vagus-reccunt laryngeal/ CN X
close rima glottis, adduct (close) vocal cords

Front 18

cricothyroid

Back 18

Vagus-superior laryngeal/ CN X
tense and elongate vocal cords by opening the cricothyroid joint

Front 19

lateral cricoartenoid

Back 19

Vagus- Reuccurent laryngeal
adduction (closing) of vocal ligaments

Front 20

Posterior cricoarytenoid

Back 20

Vagus-recurrent laryngeal/ CN X
abduction (opening) of vocal ligaments, opens rima glottis

Front 21

Thyroarytenoid

Back 21

Vagus-reccurrent laryngeal (CN X)
Shortens/ relaxes vocal ligaments

Front 22

arytenoid-oblique

Back 22

Vagus-recurrent layrngeal/ X

Adducts/ closes vocal ligaments, closes rima glottis

Front 23

Lateral pterygoid

Back 23

Trigeminal CN V -V3,Mandibular division/
Depresses, protrudes, and moves mandible

Front 24

masseter

Back 24

Trigeminal (V)-V3 (mandibular)

elevation and protraction of mandible

Front 25

Medial Pterygoid

Back 25

Trigeminal (V)-V3 mandibular

elevates mandible, closes jaw, side to side movements

Front 26

Temporalis

Back 26

Trigeminal (V)-V3 (mandibular)

elevates and retracts mandible

Front 27

Longus Capitis

Back 27

C1-C3/4

flexion of nect at atlanto-occipital joint

Front 28

Longus Colli

Back 28

C2-C6
flexes head and neck

Front 29

middle scalene

Back 29

ventral rami of C3-C8
elevate 1st rib, rotate neck to opposite side

Front 30

posterior scalene

Back 30

C6-C8

elevates 2nd rib, tils neck to same side

Front 31

Sternocleidomastoid

Back 31

Accessory (CN XI)
Tils head to same side, rotate to opposite side, together- flex neck, raise sternum

Front 32

omohyoid inferior belly

Back 32

anas cervicalis (C1-C3)
depresses larynx and hyoid

Front 33

omohyoid-superior belly

Back 33

ansa cervicalis (C1-C3)
depresses larynx and hyoid

Front 34

sternohyoid

Back 34

ansa cervicalis (C1-C3)
depresses hyoid

Front 35

sternothyroid

Back 35

C1 via hypoglossal (CN XII)

elevates thyroid, depress hyoid

Front 36

thyrohyoid

Back 36

C1 via hypoglossal (CN XII)

elevates thyroid, depresses hyoid

Front 37

digastric-anterior belly

Back 37

Trigeminal (V)-V3 mandibular divison
opens jaw

Front 38

digastric posterior belly

Back 38

Facial (V)
opens jaw

Front 39

mylohyoid

Back 39

Trigeminal V-V3 mandibular divison, inf. alveloar, n. to mylohyoid

raises oral cavity, elevates hyoid, elevates tongue, depresess mandible

Front 40

Stylohyoid

Back 40

Facial (V)
elevates hyoid during deglutition

Front 41

Levator veli palatini

Back 41

Vagus- pharyngeal branch (X)
elevates soft palate

Front 42

tensor veli palatini

Back 42

Vagus-pharyngeal branch (x)

tenses soft palate

Front 43

inferior pharyngeal constrictor

Back 43

vagus (X)
deglutition

Front 44

middle pharyngeal constrictor

Back 44

Vagus (x)
deglutition

Front 45

palatopharyngeus

Back 45

Vagus (x) accessory (XI)
deglutition (raise pharynx over bolus of food)

Front 46

Salpingopharyngeus

Back 46

Vagus (x) and accessory (XI)
deglutition

Front 47

stylopharyngeus

Back 47

Glossopharyngeal ( IX)

elevates layrnx, elevates pharynx durig deglutition

Front 48

Superior pharyngeal constrictor

Back 48

Vagus-pharyngeal plexus

deglutition

Front 49

uvula

Back 49

Vagus pharyngeal branch

Front 50

genioglossus

Back 50

Hypoglossal (XII)

depresses and retracts tongue

Front 51

palatoglossus

Back 51

Hypoglossal (XII)

raises back of tongue

Front 52

Styloglossus

Back 52

Hypoglossal (XII)

retraction and elevation of the tongue