Intrinsic Muscles

Question 0

What is the insertion of the multifidus?

Answer 0

Obliquely to entire length of spinous processes of vertebrae 2-4 segments superior to origin. Thickest in lumbar

Question 1

What is the origin of the multifidus?

Answer 1

Posterior sacrum, post. sup iliac spine of ilium, aponeurosis of erector spinae, sacroiliac ligaments, mamillary processes of lumbar, transverse processes of thoracic, articular processes C4-C7

Question 2

What innervates the multifidus?

Answer 2

Posterior ramus of spinal nerves

Question 3

What are the actions of multifidus?

Answer 3

Unilateral contraction rotates to contralateral side; stabilizes vertebrae during local movements of vertebral column

Question 4

What is the origin of rotatores?

Answer 4

Transverse processes of vertebrae

Question 5

What is the insertion of rotatores?

Answer 5

Superomedially to attach to junction of lamina and transverse process or spinous process of vertebra immediately (brevis) or two segments (longus) superior to vertebra of origin

Question 6

What innervates the rotatores?

Answer 6

Posterior rami of spinal nerves

Question 7

What are the actions of rotatores?

Answer 7

Organs of proprioception, stabilize vertebra and assist with local extension. Rotatory movements of vertebral column

Question 8

What is the origin of semispinalis?

Answer 8

Transverse processes of C4-T10 vertebrae

Question 9

What is the insertion of semispinalis?

Answer 9

Occipital bone and spinous processes in upper thoracic and cervical regions, 4-6 segments

Question 10

What innervates semispinalis?

Answer 10

Posterior rami of spinal nerves

Question 11

What are the actions of semispinalis?

Answer 11

Extend head and thoracic and cervical regions of vertebral column and rotates them contralaterally

Question 12

Splenius

Origin

Answer 12

Spinous processes of C7-T6 vertebrae and nuchal ligament

Question 13

Splenius

Insertion

Answer 13

Capitis-mastoid process of temporal bone and lateral third of superior nuchal line of occipital bone
Cervicis-tubercles of transverse processes of C1-C3 or C4 vertebrae

Question 14

Splenius

Innervation

Answer 14

Posterior rami of spinal nerves

Question 15

Splenius

Actions

Answer 15

Alone-laterally flex neck and rotate head to side of active muscles
Together-extend head and neck

Question 16

Iliocostalis

origin

Answer 16

Posterior surface of sacrum, sacroiliac ligaments, supraspinous ligament, posterior part of iliac crest, spinous processes of inferior lumbar and sacral

Question 17

Iliocostalis

Insertion

Answer 17

Angles of lower ribs and cervical transverse processes

Question 18

Iliocostalis

Innervation

Answer 18

Posterior rami of spinal nerves

Question 18

Iliocostalis

Actions

Answer 18

Unilaterally-laterally flex vertebral column

Bilaterally-extend vertebral column and head

Question 18

Longissimus

Origin

Answer 18

Posterior surface of sacrum, posterior part of iliac crest, sacroiliac ligaments, supraspinous ligament, spinous processes of inferior lumbar and sacral

Question 19

Longissimus

Insertion

Answer 19

between tubercles and angles to transverse processes in cervical and thoracic, mastoid process of temporal bone

Question 20

Longissimus

Innervation

Answer 20

Posterior rami of spinal nerves

Question 21

Longissimus

Actions

Answer 21

Unilaterally-laterally flex vertebral column

Bilaterally-extend vertebral column and head

Question 22

Spinalis

Origin

Answer 22

Posterior surface of sacrum, posterior part of iliac crest, sacroiliac ligaments, supraspinous ligament, spinous processes of inferior lumbar and sacral

Question 23

Spinalis

Insertion

Answer 23

Spinous processes in upper thoracic region to cranium

Question 24

Spinalis

Innervation

Answer 24

Posterior rami of spinal nerves

Question 25

Spinalis

Actions

Answer 25

Unilaterally-laterally flex vertebral column

Bilaterally-extend head and vertebral column