Anatomy - Intrinsic Back Muscles

Question 1

Which muscles of the intrinsic back muscles are the most superficial? (2)

Answer 1

Splenius capitus

Splenius cervicus

Question 2

Which muscles of the intrinsic back muscles are the intermediate? (3)

Answer 2

Iliocostalis
Longissimus
Spinalis

Question 3

Which muscles of the intrinsic back muscles are the deepest? (3)

Answer 3

Semispinalis
Multifidus
Rotatores

Question 4

Splenius Capitus: Origins? (2)

Answer 4

Lower aspect of ligamentum nuchae

Spinous processes of C7 - T3/T4

Question 5

Splenius Capitus: Attachments? (2)

Answer 5

Mastoid process
Occipital bone (skull)

Question 6

Splenius Capitus: Innervation?

Answer 6

Posterior rami of spinal nerves C3 and C4

Question 7

Spenius Capitus: Actions?

Answer 7

Rotate head relative to ipsilateral splenius capitus

Question 8

Splenius Cervicis: Origins?

Answer 8

Spinous processes of T3 - T6

Question 9

Splenius Cervicis: Attachments?

Answer 9

Transverse processes of C1 - C3/4

Question 10

Splenius Cervicis: Innervation?

Answer 10

Posterior rami of the lower cervical spinal nerves

Question 11

Splenius Cervicis: Actions?

Answer 11

Rotate head relative to ipsilateral splenius cervicus

Question 12

What 3 muscles make up the erector spinae?

Answer 12

Iliocostalis
Longissimus
Spinalis

Question 13

Iliocostalis: Origins?

Answer 13

Common Tendinous Origin

Question 14

Iliocostalis: Attachments? (2)

Answer 14

Costal angle of the ribs

Cervical transverse processes

Question 15

Iliocostalis: Innervation?

Answer 15

Posterior rami of the spinal nerves

Question 16

Iliocostalis: Actions (2)

Answer 16

Acts unilaterally to laterally flex the vertebral column.

Acts bilaterally to extend the vertebral column and head.

Question 17

Longissimus: Origins?

Answer 17

Common Tendinous Origin

Question 18

Longissimus: Attachments? (3)

Answer 18

Lower ribs
Transverse processes of C2 – T12,
Mastoid process of the skull

Question 19

Longissimus: Innervation?

Answer 19

Posterior rami of the spinal nerves

Question 20

Longissimus: Actions? (2)

Answer 20

Acts unilaterally to laterally flex the vertebral column.

Acts bilaterally to extend the vertebral column and head.

Question 21

Spinalis: Origins?

Answer 21

Common Tendinous Origin

Question 22

Spinalis: Attachments? (3)

Answer 22

Spinous process of C2
Spinous processes of T1 - T8
Occipital bone (skull)

Question 23

Spinalis: Innervation

Answer 23

Posterior rami of the spinal nerves

Question 24

Spinalis: Actions? (2)

Answer 24

Acts unilaterally to laterally flex the vertebral column.

Acts bilaterally to extend the vertebral column and head.

Question 25

Semispinalis: Origins?

Answer 25

Transverse processes of C4 - T10

Question 26

Semispinalis: Attachments? (2)

Answer 26

``` Spinous processes of C2 - T4 Occipital bone (skull) ```

Question 27

Semispinalis: Innervation

Answer 27

Posterior rami of the spinal nerves

Question 28

Semispinalis: Actions? (2)

Answer 28

Extends and contralaterally rotates the head and vertebral column.

Question 29

Multifidus: Origins? (6)

Answer 29

``` Sacrum Posterior iliac spine Common Tendinous Origin Mamillary processes of lumbar vertebrae Transverse processes of T1 - T3 Articular processes of C4 - C7 ```

Question 30

Multifidus: Innervation?

Answer 30

Posterior rami of the spinal nerves

Question 31

Multifidus: Attachments?

Answer 31

The fibesr ascend 2-4 vertebral segments, attaching the spinous processes of the vertebrae.

Question 32

Multifidus: Actions?

Answer 32

Stablizes the vertebral column

Question 33

Rotatores: Origins?

Answer 33

Vertebral transverse processes

Question 34

Rotatores: Attachments?

Answer 34

Attaches to the lamina and spinous process of the immediately superior vertebrae.

Question 35

Rotatores: Innervation?

Answer 35

Posterior rami of the spinal nerves

Question 36

Rotatores: Actions?

Answer 36

Stablizes the vertebral column