Neck Muscle Actions + Innervations

Question 1

rectus capitis posterior major innervation

Answer 1

dorsal rami of C1 (suboccipital nerve)

Question 2

rectus capitis posterior major action

Answer 2

head extension

Question 3

rectus capitis posterior minor innervation

Answer 3

dorsal rami of C1 (suboccipital nerve)

Question 4

rectus capitis posterior minor action

Answer 4

head extension
ipsilateral rotation

Question 5

obliquus capitis superior innervation

Answer 5

dorsal rami of C1 (suboccipital nerve)

Question 6

obliquus capitis superior action

Answer 6

head extension
ipsilateral sidebend
contralateral rotation

Question 7

obliquus capitis inferior innervation

Answer 7

dorsal rami of C1 (suboccipital nerve)

Question 8

obliquus capitis inferior action

Answer 8

neck extension
ipsilateral SB + rotation

Question 9

platysma innervation

Answer 9

cervical branch of facial nerve (CN VII)

Question 10

platysma action

Answer 10

depression of mandible +
elevates neck skin when the mouth is closed

Question 11

sternocleidomastoid (SCM) innervation

Answer 11

spinal accessory nerve (CN XI)

Question 12

sternocleidomastoid (SCM) action

Answer 12

neck flexion
ipsilateral sidebend
contralateral rotation
thorax + shoulder elevation

Question 13

stylohyoid innervation

Answer 13

facial nerve (CN VII)

Question 14

stylohyoid action

Answer 14

hyoid elevation

Question 15

digastric posterior belly innervation

Answer 15

facial nere (CN VII)

Question 16

digastric anterior belly innervation

Answer 16

mylohyoid branch of trigeminal nerve (CN V3)

Question 17

digastric (posterior + anterior belly) action

Answer 17

hyoid elevation
depression + retraction of mandible

Question 18

mylohyoid innervation

Answer 18

mylohyoid branch of trigeminal nerve (CN V3)

Question 19

mylohyoid action

Answer 19

elevation of hyoid
depression + retraction of mandible

Question 20

geniohyoid innervation

Answer 20

C1 through hypoglossal nerve (CN XII)

Question 21

geniohyoid action

Answer 21

elevation of hyoid
depression + retraction of mandible

Question 22

sternohyoid innervation

Answer 22

ansa cervicalis

Question 23

sternohyoid action

Answer 23

depression of hyoid and larynx

Question 24

sternothyroid innervation

Answer 24

ansa cervicalis

Question 25

sternothyroid action

Answer 25

depression of thyroid cartilage and larynx

Question 26

omohyoid innervation

Answer 26

ansa cervicalis

Question 27

omohyoid action

Answer 27

hyoid depression

Question 28

thyrohyoid innervation

Answer 28

C1 through hypoglossal nerve (CN XII)

Question 29

thyrohyoid action

Answer 29

hyoid depression elevation of thyroid cartilage + larynx

Question 30

anterior scalene innervation

Answer 30

ventral rami of C4-C6

Question 31

anterior scalene action

Answer 31

flexion ipsilateral sidebend contralateral rotation 1st rib elevation

Question 32

middle scalene innervation

Answer 32

ventral rami of spinal nerve C2-C8

Question 33

middle scalene action

Answer 33

neck ipsilateral sidebend 1st rib elevation

Question 34

posterior scalene innervation

Answer 34

ventral rami of C6-C8

Question 35

posterior scalene action

Answer 35

neck ipsilateral sidebend 2nd rib elevation

Question 36

longus capitis innervation

Answer 36

ventral rami of cervical nerves (C1-C3)

Question 37

longus capitis action

Answer 37

head flexion

Question 38

longus colli innervation

Answer 38

ventral rami of cervical nerves (C2-C6)

Question 39

longus colli action

Answer 39

head flexion + SB

Question 40

rectus capitis anterior innervation

Answer 40

ventral rami of cranial nerves (C1-C2)

Question 41

rectus capitis anterior action

Answer 41

head flexion at OA joint

Question 42

rectus capitis lateralis innervation

Answer 42

ventral rami of cranial nerves (C1-C2)

Question 43

rectus capitis lateralis action

Answer 43

ipsilateral neck SB