Intrinsic Muscles Of Back

Question 1

Epaxial Muscles

Answer 1

Intrinsic Muscles

Question 2

What is the intrinsic muscles innervated by?

Answer 2

Dorsal Rami of spinal nerves

Question 3

What 2 muscles make up the superficial intrinsic muscle group?

Answer 3

Splenius Capitis and cervicis

Question 4

what 3 muscles make up the intermediate layer of intrinsic muscles?

Answer 4

Errector spinae - Iliocostal, longissimus, and spinalis

Question 5

What muscles make up the deep layer of intrinsic muscles?

Answer 5

Transversespinalis

Question 6

What muscles make up the transversospinalis?

Answer 6

• Semispinalis, multifidus, and rotatores
• Deep segmental muscles: interspinales, intertransversarii, and levatores costarum

Question 7

What arteries supply the upper cervial region?

Answer 7

Occipital a. And Deep Cervical a.

Question 8

What artery supplies the thoracic region?

Answer 8

Posterior intercostal a.a

Question 9

What artery supplies the lumbar region?

Answer 9

Lumbar a.a

Question 10

Origin of Splenius Capitis

Answer 10

• Caudal half of ligamentum nuchae
• S.P of C7-T3/4

Question 11

Insertion of Splenius capitis

Answer 11

• Mastoid Process
• occipital bone inferior to lateral 1/3 of superior nuchal line

Question 12

Actions of Splenius capitis

Answer 12

• Unilateral: ipsilateral rotation of the head
• Bilateral: extends head

Question 13

Innervation of Splenius capitis

Answer 13

Upper cervical dorsal rami (C2,C3)

Question 14

Blood supply of Splenius capitis

Answer 14

• Transverse cervical a.
• occipital a.

Question 15

Origin of Splenius cervicis

Answer 15

S.p. of T3-T6

Question 16

Insertion of Splenius cervicis

Answer 16

Posterior tubercles of T.P of C1-C3

Question 17

Actions of Splenius cervicis

Answer 17

• unilateral: ipsilateral rotates upper cervical vertebrae
• bilateral: extends upper cervical spine

Question 18

Innervation of Splenius cervicis

Answer 18

Lower cervical dorsal rami

Question 19

Blood supply of Splenius cervicis

Answer 19

• occipital a.
• transverse cervical a

Question 20

Erector Spinae Muscles include:

Answer 20

1. Iliocostalis
2. Longissimus
3. Spinalis

Question 21

Most lateral erector spinae muscle:

Answer 21

Iliocostalis

Question 22

3 divisions of Iliocostalis:

Answer 22

1. Lumborum
2. Thoracis
3. Cervicis

Question 23

Iliocostalis Lumborum origin

Answer 23

• iliac crest
• Thoracolumbar fascia

Question 24

Iliocostalis Lumborum insertion

Answer 24

Ribs 8-9, lateral to angle

Question 25

Iliocostalis Lumborum action

Answer 25

- extension and lateral flexion of the vert column

Question 26

Iliocostalis Lumborum Innervation

Answer 26

Dorsal rami of lumbar nerves

Question 27

Blood supply of Iliocostalis Lumborum

Answer 27

- Lumbar a.a - posterior intercostal a.a

Question 28

Origin of Iliocostalis thoracis

Answer 28

Lower 6 ribs, medial to Iliocostalis lumborum

Question 29

Insertion of Iliocostalis thoracis

Answer 29

- Upper 6 ribs - T.P of C7

Question 30

Innervation of Iliocostalis thoracis

Answer 30

Dorsal rami of thoracic nerves

Question 31

Action of Iliocostalis thoracis

Answer 31

- extension of the vertebral column

Question 32

Blood supply of the Iliocostalis thoracis

Answer 32

Posterior intercostal a.a

Question 33

Origin of Iliocostalis cervicis

Answer 33

Upper 3-6 ribs @ the angle

Question 34

Insertion of Iliocostalis cervicis

Answer 34

T.P of C4-C6

Question 35

Actions of Iliocostalis Cervicis

Answer 35

Extension and lateral flexion of the vert column

Question 36

Innervation of the Iliocostalis cervicis

Answer 36

Dorsal rami of C4-C6

Question 37

Blood supply of Iliocostalis cervicis

Answer 37

Posterior intercostal a.a

Question 38

Erector Spinae muscle that is thickest and medial to Iliocostalis

Answer 38

Longissimus

Question 39

3 divisions of longissimus

Answer 39

1. Thoracis 2. Cervicis 3. Capitis

Question 40

Origin of Longissimus thoracis

Answer 40

- thoracolumbar fascia - Accessory and T.Ps of the lumbar vertebrae

Question 41

Insertion of longissimus thoracis

Answer 41

- lower 9 ribs - lower 9 T.P of thoracic vert (T4-T12)

Question 42

Action of longissimus thoracis

Answer 42

Extension and lateral flexion of the vert column

Question 43

Innervation of longissimus thoracis

Answer 43

Dorsal rami of the thoracic s.n

Question 44

Blood supply of longissimus thoracis

Answer 44

- post intercostal a.a - lumbar a.a