Deep Back Flashcards Preview

Anatomy! Written 1 > Deep Back > Flashcards

Flashcards in Deep Back Deck (42):
1

Action of Deep Back Muscles

Maintain Posture
Balance
Produce Movements (flexion, extension, rotation) of back

2

Places for most of the attachments

Transverse and spinous processes

3

Intrinsic back muscles are innervated by the

Dorsal Primary Rami of spinal nerves

4

Groups of the intrinsic back muscles

1. Splenius Group
2. Erector Spinae Group
3. Transverseospinalis Group
4. Suboccipital Muscles

5

3 layers

Superficial Layer - Erector Spinae and Splenius
Intermediate Layer - Transversospinalis
Deep Layer - Semental and suboccipital

6

Splenius Group

Bandage Like
Arise from posterior midline of back and go laterally and superiorly to insertion
Most superficial of the intrinsic muscles
Splenius Capitis
Splenius Cervicis

7

Splenius Capitis

Broad, flat muscle of the neck
Partly covered by trap and sternocleido
Upper and larger of the two

8

Splenius Capitis Origin and Insertion

O = LIgamentum Nuchae, spinous process of C7 - T3
I = Occipital bone, mastoid process

9

Spleius Cervicis

Narrow, below and parallel to capitis
No fibers attach to skull

10

Splenius Cervicis O and I

O = Spinous process of T3-T6
I = Transverse process of C2-C4

11

Erector Spinae Group

Largest muscle mass of the back
*Chief extensor of Vertebral Column, unilaterally it flexes the head and vertebral column, bilaterally extends the head and vertebral column
Iliocostalis
Longissimus
Spinalis

12

Iliocostalis

Iliocostalis Lumborum
Iliocostalis Thoracis
Iliocostalis Cervicis
Most lateral of erector spinae group

13

Iliocostalis Lumborum O and I

O = Common tendon of erector spinae
I = angle of ribs 6-12

14

Iliocostalis Thoracis O and I

O = Lower 6 ribs
I = Upper 6 ribs

15

Iliocostalis Cervicis O and I

O = Ribs 3-6
I = Transverse process of C4-C6

16

Longissimus

associated with trans. processes of vertebrae
intermediate division
lower part blends with iliocostalis lumborum
Longissimus thoracis
Longissimus cervicis
Longissimus capitis

17

Longissimus thoracis O and I

O = part of common tendon
I = Lower 9 ribs

18

Longissimus cervicis O and I

O = Transverse process of T1-T5
I = Transverse process of C2-C6

19

Longissimus capitits O and I

O = tendon of insertion of long cervicis
I = Mastoid process

20

Spinalis

Most medial and smallest division
Poorly developed (usually only thoracic part is present)
Spinalis Thoracis
Spinalis Cervicis
Spinalis Lumborum

21

Transversospinalis Muscle Group

Deep to the erector spinae
Semispinalis
Multifidus
Segmental Muscles

22

Semispinalis

Thoracis, Cervicis, Capitis
Muscle fibers run longitudinally
Lie superficial to the multifidus

23

Spinalis thoracis O and I

O = Spine of T11-L2
I = Spine of T1 - T4

24

Semispinalis Cervicis O and I

O = Transverse process of T1 -T6
I = Spine of C2 - C5

25

Semispinalis Capitis O and I

O = Transverse and Articular processes of T1-T6
I = Occipital Bone

26

Multifidus

Deep to semispinalis
Thickest in lumbar region
Sacral and Lumbar areas are covered by the erector spinae
Thoracic and Cervical areas are covered by semispinalis

27

Segmental Muscles

Deepest part of the transversospinalis group
Deep to multifidus
Three Sets = Interspinalis, Intertransversarii, Rotators

28

Interspinalis

Well developed in cervical and lumbar regions
Muscles are separated by interspinous ligaments
C2 to T1
Lacking in thoracic region

29

Intertransversarii

Vertically btw adjacent transverse processes
Well developed in cervical and lumbar regions
None in thoracic region

30

Rotators

Single origin and single insertion
Best developed in thoracic region
Long and Short rotators

31

Long Rotators (Longus) O and I

O = Transverse Processes
I = Spinous processes of 2nd vertebrae above
Found in lumbar, thoracic and cervical areas
Skip a vertebrae

32

Short Rotators (Brevis) O and I

O = Transverse processes
I = Spinous process of vertebrae above
Lumbar, thoracic, and cervical areas
Attach to vertebrae above (don't skip)

33

Suboccipital Muscles

Connects skull to atlas and axis
Oblique Capitis Inferior
Oblique Capitis Superior
Rectus Capitis Posterior Major
Rectus Capitis Posterior Minor
Nerve supply = Dorsal Ramus of C1 (suboccipital nerve)
Greater Occipital Nerve = sensory nerve to posterior scalp - no innervation to these muscles though

34

Oblique Capitis Inferior O and I

O = Spine of axis
I = Transverse process of atlas

35

Oblique Capitis Superior O and I

O = Transverse process of atlas
I = Occipital bone

36

Recuts Capitis Posterior Major O and I

O = Spine of axis
I = Occipital bone

37

Rectus Capitis Posterior Minor O and I

O = Posterior tubercle of atlas
I = Occipital bone

38

Vertebral Column Movements

Flexion
Extension
Lateral Flexion (side to side)
Rotation (same or opposite side)

39

Flexion -

Anterior trunk muscles
Gravity
Back muscles act as antagonistic

40

Extension -

All deep back muscles except intertransversarii
Erector Spinae is chief extensor

41

Lateral Flexion -

Intertransversari
Splenius Capitis and Cervicis rotate the head
All muscles on opposite side control flexion b relaxing gradually

42

Rotation -

Multidifidus, rotators, semispinalis - rotate to opposite side
Splenius and erector spinae - to same side