Lecture 11-intrinsic Back Muscles Flashcards Preview

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Flashcards in Lecture 11-intrinsic Back Muscles Deck (49):
0

Intrinsic back muscles

Muscles concerned with ....... ..... ....... ....... and maintenance of .........

movements of the spine
posture

1

In the standing position, most of the body’s weight falls in ...... of the vertebral column.

front

2

Intrinsic back muscles
•Deep back muscles
•Back muscles “proper”
•Maintain posture and control movements of vertebral column.
•Innervated by ...... ...... of spinal nerves.

posterior rami

3

Posterior rami of .... ..... .... ... .... supply deep muscles of the back but DO NOT supply the ..... of the back.

C1, C7, C8, L4 & L5
skin

4

Intrinsic back muscles
•Superficial layer: ........ ...... And ...... .......

splenius capitis, splenius cervicis.

5

Intrinsic back muscles
•Intermediate layer: ......... ...... Which is made up of which three muscles

erector spinae (iliocostalis, longissimus, spinalis)

6

Intrinsic back muscles
•Deep layer: .................which is made up of which three muscles

transversospinalis (semispinalis, multifidus, rotatores)

7

Superficial layer:
Splenius muscles
•Thick, flat, ............... surface of neck
•“Splenion” = Latin for ...........
•Cover and hold deep neck muscles in position

•Splenius cervicis
•Splenius capitis

posterolateral
bandage

8

Splenius cervicis
Proximal Attachment:

SPs of T3-T6

9

Splenius cervicis
Distal attachment (insertion)

Transverse processes
of C1-C3 vertebrae

10

Splenius cervicis
Innervation

Posterior rami of lower cervical spinal nerves

11

Splenius cervicis
Main action

Unilaterally: laterally flexes and rotates neck to same side
Bilaterally: extends neck

12

Splenius Capitis
Proximal Attachment:

Nuchal ligament, SPs of C7-T3

13

Splenius Capitis
Distal attachment (insertion)

Mastoid process of temporal bone and lateral third of superior nuchal line

14

Splenius Capitis
Innervation

Posterior rami of middle cervical spinal nerves

15

Splenius Capitis
Main action

Unilaterally: laterally flexes neck and rotates head to same side

16

Intermediate layer:
Erector spinae muscles
•Located between the ........ ......... medially and ........ ....... laterally.
•Chief ......... of the vertebral column.

•Iliocostalis (most lateral)
•Longissimus (intermediate)
•Spinalis (medial)

extensors
spinous processes
rib angles

17

Iliocostalis
Proximal Attachment:

Posterior sacrum
iliac crest
SPs of lower lumbar and sacral vertebrae

18

Iliocostalis
Distal attachment

Angles of lower ribs
cervical transverse processes

19

Iliocostalis
Innervation

Posterior rami of spinal nerves

20

Iliocostalis
Main action

Unilaterally:
Laterally flex vertebral column

Bilaterally:
extends vertebral column and head

21

Longissimus
Proximal Attachment:

Posterior sacrum
iliac crest
SPs of lower lumbar and sacral vertebrae

22

Longissimus
Distal attachment

Between tubercles and angles of ribs
tranverse processes of thoracic and cervical vertebrae
mastoid process

23

Longissimus
Innervation

Posterior rami of spinal nerves

24

Longissimus
Main action

Unilaterally:
Laterally flex vertebral column

Bilaterally:
extends vertebral column and head

25

Spinalis
Proximal Attachment:

Posterior sacrum
iliac crest
SPs of lower lumbar and sacral vertebrae

26

Spinalis
Distal attachment

Spinous processes of upper thoracic and midcervical vertebrae, and cranium

27

Spinalis
Innervation

Posterior rami of spinal nerves

28

Spinalis
Main action

Unilaterally: Laterally flex vertebral column

Bilaterally: extends vertebral column and head

29

Deep layer:
Transversospinales includes which three muscles

•Semispinalis
•Multifidus
•Rotatores

30

Semispinalis
Proximal Attachment:

TPs of C4-T12

31

Semispinalis
Distal attachment

Spinous processes of cervical and thoracic vertebrae

32

Semispinalis
Innervation

Posterior rami of spinal nerves

33

Semispinalis
Main action

Extends head, neck and thorax and rotates them to opposite side

34

Multifidus
Proximal Attachment:


Posterior Sacrum,
Ilium
TPs of T1-T12
articular processes of C4-C7
PSIS
SI ligaments
Mammillary processes of lumbar vertebrae

35

Multifidus
Distal attachment

Spinous processes of vertebrae above, spanning 2-4 segments

36

Multifidus
Innervation


Posterior rami of spinal nerves

37

Multifidus
Main action

Stabilises spine during local movements.
Pain/proprioception.

38

Rotatores
Proximal Attchment:

TPs best in thoracic region

39

Rotatores
Distal attachment

Lamina and transverse processes or spine above, spanning 1 or 2 segments

40

Rotatores
Innervation

Posterior rami of spinal nerves

41

Rotatores
Main action

Stabilise
extend
rotate spine.
Proprioception.

42

Electromyographic study of the back muscles => increased activity during the first stage of anterior flexion but ............. as extreme flexed position approached

decreases

43

•Extreme flexed position =>back muscles ........, ligaments take over stabilising role.
•This explains the danger of heavy lifting while the trunk is in extreme flexed position.

relaxed

44

What muscles comprise the superficial layer of intrinsic back muscles?

Splenius capitis, splenius cervicis.

45

What region of the spine are rotatores best developed?

Thoracic

46

What regions of the spine does semispinalis traverse?

Cervical and thoracic

47

What is the largest muscle crossing the sacroiliac joint?

Multifidus

48

Do posterior rami of L1, L2 & L3 innervate muscle and skin of the back?

YES