Neck Muscles

Question 1

Sternocleidomastoid m. innervation

Answer 1

Spinal Accessory Nerve; C2 and C3 nerves (pain and proprioception)

Question 2

Sternocleidomastoid m. superior attachment

Answer 2

Lateral surface of mastoid process and lateral half of superior nuchal line

Question 3

Sternocleidomastoid m. inferior attachment

Answer 3

Sternal head: anterior surface of manubrium of sternum

Clavicular head: Superior surface of medial third of clavicle

Question 4

Sternocleidomastoid m. actions

Answer 4

Unilateral: Tilts head to same side (lateral flexion) and rotates it so face is turned superiorly toward opposite side
Bilateral: 1) extends neck at atlanto-occipital joint (2) flexes cervical vertebrae so that chin approaches manubrium or 3) extends superior cervical vertebrae while flexing inferior vertebrae so chin is thrust forward

Question 5

Sternohyoid m. innervation

Answer 5

C1-C3 by branch of ansa cervicalis n

Question 6

Sternohyoid m. origin

Answer 6

Manubrium of sternum and medial end of clavicle

Question 7

Sternohyoid m. insertion

Answer 7

Body of hyoid

Question 8

Sternohyoid m. action

Answer 8

Depresses hyoid after elevation during swallowing

Question 9

Omohyoid m. innervation

Answer 9

C1-C3 by branch of ansa cervicalis n.

Question 10

Omohyoid m.origin

Answer 10

Superior border of scapula near suprascapular notch

Question 11

Omohyoid m. insertion

Answer 11

Inferior border of hyoid

Question 12

Omohyoid m. action

Answer 12

Depresses, retracts, and steadies hyoid

Question 13

Sternothyroid m. innervation

Answer 13

C2 and C3 by branch of ansa cervicalis n.

Question 14

Sternothyroid m. origin

Answer 14

Posterior surface of manubrium of sternum

Question 15

Sternothyroid m. insertion

Answer 15

Oblique line of thyroid cartilage

Question 16

Sternothyroid m. action

Answer 16

Depresses hyoid and larynx

Question 17

Longus colli m. innervation

Answer 17

Anterior rami of C2-C6 spinal nerves

Question 18

Longus colli m. superior attachment

Answer 18

Anterior tubercle of atlas; bodies of C1-C3 and transverse processes of C3-C6 vertebrae

Question 19

Longus colli m. inferior attachment

Answer 19

Bodies of C5-T3 vertebrae ; transverse processes of C3-C5 vertebrae

Question 20

Longus colli m. action

Answer 20

Flexes neck with rotation to opposite side if acting unilaterally

Question 21

Longus capitis m. innervation

Answer 21

Anterior rami of C1-C3 spinal nerves

Question 22

Longus capitis m. superior attachment

Answer 22

Basilar part of occipital bone

Question 23

Longus capitis m. inferior attachment

Answer 23

Anterior tubercles of C3-C6 transverse processes

Question 24

Longus capitis m. action

Answer 24

Flex head

Question 25

Anterior scalene m. innervation

Answer 25

Cervical spinal nerves C4-C6

Question 26

Anterior scalene m. superior attachment

Answer 26

Transverse processes of C4-C6 vertebrae

Question 27

Anterior scalene m. inferior attachment

Answer 27

1st rib

Question 28

Anterior scalene m. action

Answer 28

Flexes head

Question 29

Middle Scalene m. innervation

Answer 29

Anterior rami of cervical spinal nerves

Question 30

Middle scalene m. superior attachment

Answer 30

Posterior tubercles of transverse processes of C4-C6 vertebrae

Question 31

Middle scalene m. inferior attachment

Answer 31

Superior surface of 1st rib; posterior groove for subclavian artery

Question 32

Middle scalene m. action

Answer 32

Flexes neck laterally; elevates 1st rib during forced inspiration

Question 33

Posterior scalene m. innervation

Answer 33

Anterior rami of cervical spinal nerves C7 and C8

Question 34

Posterior scalene m. superior attachment

Answer 34

Posterior tubercles of transverse processes of C4-C6 vertebrae

Question 35

Posterior scalene m. inferior attachment

Answer 35

External border of 2nd rib

Question 36

Posterior scalene m. action

Answer 36

Flexes neck laterally; elevates 2nd rib during forced inspiration