4 Intrinsic Muscles of Back

Question 1

Intrinsic Muscles of Back

Identify 1. O & I

Answer 1

1. Semispinalis capitis muscle

Origin (Inferior Attachment): The semispinalis capitis muscle arises by a series of tendons from the transverse processes of the first 6 or 7 thoracic vertebrae and the lower cervical vertebra.

Insertion (Superior Attachment): This broad muscle inserts between the superior and inferior nuchal lines of the occipital bone.

Question 2

Intrinsic Muscles of Back

Identify

Answer 2

1. the erector spinae (the iliocostalis, longissimus, and spinalis muscles)

Question 3

Intrinsic Muscles of Back

Identify 1. Action

Answer 3

1. Semispinalis capitis muscle

Action: Extends the head and cervical spine, and rotates the head so that the face turns toward the opposite side.

Question 4

Intrinsic Muscles of Back

Identify 1. Nerve

Answer 4

1. Semispinalis capitis muscle

Innervation: Posterior rami of cervical spinal nerves.

Question 5

Intrinsic Muscles of Back

List semispinalis muscles

Answer 5

The semispinalis muscles (capitis, cervicis, and thoracis components)

Question 6

Intrinsic Muscles of Back

The semispinalis capitis muscle covers ____ (which muscle?)

Answer 6

the semispinalis cervicis muscle.

Question 7

Intrinsic Muscles of Back

IThe semispinalis muscles (capitis, cervicis, and thoracis components) are part of ___ (muscle group?)

Answer 7

1. the transversospinal muscle group

Question 8

Intrinsic Muscles of Back

The semispinalis muscles (capitis, cervicis, and thoracis components) are part of the transversospinal muscle group

→ which is situated deep to the erector spinae and fills the concave region between ___ and ___

Answer 8

1. the transverse and spinous processes of the vertebrae.

Question 9

Intrinsic Muscles of Back

The erector spinae muscle comprises ____

Answer 9

1. the iliocostalis, longissimus, and spinalis muscles.

Question 10

Intrinsic Muscles of Back

The erector spinae muscle (the iliocostalis, longissimus, and spinalis muscles.)

→ Action?

Answer 10

Together, these muscles extend the vertebral column and head.

Unilaterally, they bend the vertebral column laterally.

Question 11

Intrinsic Muscles of Back

The erector spinae muscle (the iliocostalis, longissimus, and spinalis muscles.)

→ Innervation?

Answer 11

Innervation: Posterior rami of the respective spinal nerves in each region.

Question 12

Intrinsic Muscles of Back

Because of their locations, the iliocostalis muscles are classified into _____ (3 groups)

Answer 12

1. lumborum, thoracis, and cervicis groups;

Question 13

Intrinsic Muscles of Back

the longissimus muscles into ____ (3 groups)

Answer 13

thoracis, cervicis, and capitis groups

Question 14

Intrinsic Muscles of Back

the longissimus muscles into ____ (3 groups)

Answer 14

thoracis, cervicis, and capitis groups.

Question 15

Intrinsic Muscles of Back: Deep Layers

→ Identify 1

Answer 15

1. Rotatores cervicis muscle (longus; brevis)

Question 16

Intrinsic Muscles of Back: Deep Layers

→ Identify 2

Answer 16

2. Rotatores thoracis muscle (longus; brevis)

Question 17

Intrinsic Muscles of Back: Deep Layers

→ Identify 3

Answer 17

3. Levatores costarum muscle (brevis; longus)

Question 18

Intrinsic Muscles of Back: Deep Layers

→ Identify 4

Answer 18

4 Multifidus lumborum muscles

Question 19

Intrinsic Muscles of Back: Deep Layers

→ Identify 5

Answer 19

5 Multifidus thoracis muscles

Question 20

Intrinsic Muscles of Back: Deep Layers

→ Identify 6

Answer 20

6 Semispinalis thoracis muscle

Question 21

Intrinsic Muscles of Back: Deep Layers

→ Identify 7

Answer 21

7 Semispinalis capitis muscle

Question 22

Intrinsic Muscles of Back: Deep Layers

The transversospinal muscles include __

Answer 22

the semispinalis, multifidi, and rotatores.

Question 23

Intrinsic Muscles of Back: Deep Layers

The transversospinal muscles include the semispinalis, multifidi, and rotatores.

→ Most of these muscles arise from____

Answer 23

the transverse processes of adjacent vertebrae

Question 24

Intrinsic Muscles of Back: Deep Layers

The transversospinal muscles include the semispinalis, multifidi, and rotatores.

→ Most of these muscles arise from the transverse processes of adjacent vertebrae.

→ They pass superiorly to attach to ____ or ___

Answer 24

spinous or transverse processes of vertebrae above.

Question 25

Intrinsic Muscles of Back: Deep Layers

The transversospinal muscles include the semispinalis, multifidi, and rotatores.

→ important for ___ (movements)

Answer 25

• stabilizing the vertebrae during movements of the vertebral column
• assist in extension and rotary movements of the vertebrae.

Question 26

Intrinsic Muscles of Back: Deep Layers

The transversospinal muscles include the semispinalis, multifidi, and rotatores.

→ All are innervated by_____

Answer 26

posterior rami of the respective spinal nerves in each region.