Actions and Innervations

Question 1

I: Trapezius

Answer 1

Spinal accessory nerve, C1-C5 cord levels

Question 2

I: Latissimus dorsi

Answer 2

Thoracodorsal nerve, ventral rami C6-C8

Question 3

I: Levator scapulae

Answer 3

Dorsal scapular nerve, ventral ramus C5 plus ventral rami C3, C4

Question 4

I: Rhomboid major

Answer 4

Dorsal scapular nerve, ventral ramus C5 plus ventral ramus C4

Question 5

I: Rhomboid minor

Answer 5

Dorsal scapular nerve, ventral ramus C5 plus ventral ramus C4

Question 6

I: Splenius capitis

Answer 6

Dorsal rami C3-C5

Question 7

A: Splenius capitis

Answer 7

Laterally flex head and rotate face to side; bilaterally extend head

Question 8

I: Splenius cervicis

Answer 8

Dorsal rami C5-C7

Question 9

A: Splenius cervicis

Answer 9

Laterally flex and rotate neck; bilaterally extend neck

Question 10

I: Iliocostalis lumborum

Answer 10

Dorsal rami lower thoracics, all lumbars

Question 11

A: Iliocostalis lumborum

Answer 11

Extension, lateral flexion, rotation of lumbar spine; lateral movement of pelvis

Question 12

I: Iliocostalis thoracis

Answer 12

Dorsal rami T1-T6

Question 13

A: Iliocostalis thoracis

Answer 13

Extension, lateral flexion of thoracic spine

Question 14

I: Iliocostalis cervicis

Answer 14

Dorsal rami T1, T2; rarely C8

Question 15

A: Iliocostalis cervicis

Answer 15

Extension, lateral flexion, rotation of cervical spine

Question 16

I: Longissimus thoracis

Answer 16

Dorsal rami thoracic and lumbar nerves

Question 17

A: Longissimus thoracis

Answer 17

Lateral flexion thoracic spine and ribs (lumbar spine inadvertently); bilaterlally act in extension of thoracic and lumbar spine, hold thoracic and lumbar spine erect (increases lumbar lordosis); lateral movement of pelvis

Question 18

I: Longissimus cervicis

Answer 18

Dorsal rami C4-C8; T1,T2

Question 19

A: Longissimus cervicis

Answer 19

Lateral flexion of neck; bilaterally extend neck

Question 20

I: Longissimus capitis

Answer 20

Dorsal rami C1-C3, sometimes C4

Question 21

A: Longissimus capitis

Answer 21

Rotate and laterally flex head; bilaterally extend head

Question 22

I: Spinalis thoracis

Answer 22

Dorsal rami thoracics and upper lumbars

Question 23

A: Spinalis thoracis

Answer 23

Extend thoracic spine

Question 24

I: Spinalis cervicis

Answer 24

Dorsal rami cervicals

Question 25

A: Spinalis cervicis

Answer 25

Lateral flexion and rotations of cervical spine: bilaterally extend neck

Question 26

I: Spinalis capitis

Answer 26

Dorsal rami lower cervicals; upper thoracics

Question 27

A: Spinalis capitis

Answer 27

Lateral flexion and rotation of head; bilaterally extend head

Question 28

I: Semispinalis thoracics

Answer 28

Dorsal rami T1-T6

Question 29

A: Semispinalis thoracics

Answer 29

Extension, rotation, and lateral flexion of upper thoracics and lower cervical spine; bilaterally extend thoracic spine

Question 30

I: Semispinalis cervicis

Answer 30

Dorsal rami C6-C8

Question 31

A: Semispinalis cervicis

Answer 31

Extension, rotation and lateral flexion of cervical spine; bilaterally extend neck

Question 32

I: Semispinalis capitis

Answer 32

Dorsal rami C1-C6

Question 33

A: Semispinalis capitis

Answer 33

Turns face to side; bilaterally extend head (neck inadvertently)

Question 34

I: Multifidis

Answer 34

Dorsal rami C3-C8, T1-T12, L1-L5, sometimes S1

Question 35

I: Rectus capitis posterior major

Answer 35

Suboccipital nerve, dorsal ramus C1

Question 36

A: Rectus capitis posterior major

Answer 36

Turns face to side; bilaterally extends head

Question 37

I: Rectus capitis posterior minor

Answer 37

Suboccipital nerve, dorsal ramus C1

Question 38

A: Rectus capitis posterior minor

Answer 38

Extends head

Question 39

I: Obliquus capitis superior

Answer 39

Suboccipital nerve, dorsal ramus C1

Question 40

A: Obliquus capitis superior

Answer 40

Lateral flexion of head; bilaterally extends head

Question 41

I: Obliquus capitis inferior

Answer 41

Suboccipital nerve, dorsal ramus C1

Question 42

A: Obliquus capitis inferior

Answer 42

Turns face to side

Question 43

I: Quadratus Lumborum

Answer 43

Ventral rami T12, L1-L3 or L4

Question 44

A: Quadratus Lumborum

Answer 44

Steadies origin of diaphragm; when pelvis is fixed, it will laterally flex the lumbar spine; bilaterally extend the lumbar spine; stabilized and depresses the 12th rib

Question 45

I: Serratus posterior superior

Answer 45

Intercostal nerves, ventral rami T2-T5

Question 46

A: Serratus posterior superior

Answer 46

Elevate supper 5 ribs in inspiration

Question 47

I: Serratus posterior inferior

Answer 47

Intercostal nerves, ventral rami T9-T11 | Subcostal nerve, ventral ramus T12

Question 48

A: Serratus posterior inferior

Answer 48

Draws lower 4 ribs down and back; forced inspiration

Question 49

I: Longus colli

Answer 49

Ventral rami C2-C6, sometimes C7

Question 50

A: Longus colli

Answer 50

Flexion and extension of neck; rotation to the contralateral side

Question 51

I: Longus capitis

Answer 51

Ventral rami C1-C3

Question 52

A: Longus capitis

Answer 52

Flex the head

Question 53

I: Rectus capitis anterior

Answer 53

Ventral rami C1, C2

Question 54

A: Rectus capitis anterior

Answer 54

Flex the head

Question 55

I: Rectus capitis lateralis

Answer 55

Ventral rami C1, C2

Question 56

A: Rectus capitis lateralis

Answer 56

Laterally flex the head to ipsilateral side

Question 57

I: Anterior scalene

Answer 57

Ventral rami C2-C6

Question 58

I: Middle scalene

Answer 58

Ventral rami C3-C8

Question 59

I: Posterior scalene

Answer 59

Ventral rami C6-C8