Transversospinalis Musculature Flashcards Preview

Spinal Anatomy I - Exam 3 > Transversospinalis Musculature > Flashcards

Flashcards in Transversospinalis Musculature Deck (48):
1

Which muscles are identified as transversospinalis muscles?

- semispinalis
- multifidis
- rotators

2

Transversospinalis muscles represent what layer of the true back?

layer 5

3

Based on the name of this group, what is the origin-insertion of the transversospinalis?

- transverse process origin
- spinous process insertion

4

How many vertebrae can be attached to a single segment by transversospinalis muscles?

as many as nine vertebrae

5

What muscles are classically identified as semispinalis muscles?

- semispinalis thoracis
- semispinalis cervicis
- semispinalis capitis

6

What osseous parts of the vertebral column serve as an origin to the semispinalis thoracis?

transverse tubercles of T6-T10 or as low as T12

7

What segment will represent the lowest attachment site for the semispinalis thoracis?

T12

8

What is the insertion for the semispinalis thoracis?

spinous processes of C6-C6 and T1-T4

9

Contraction of the semispinalis thoracis will result in what movements?

- extension, lateral flexion, and rotation of upper thoracic and lower cervical spine
- bilaterally they act to extend the thoracic spine

10

What is the innervation of the semispinalis thoracis?

dorsal rami of T1-T6 spinal nerves (cord levels T1-T6)

11

What osseous parts of the vertebral column serve as an origin to the semispinalis cervicis?

- transverse tubercles of T1-T5 or T6
- articular processes of C4-C7

12

What is the insertion for the semispinalis cervicis?

spinous processes of C2-C5

13

Contraction of the semispinalis cervicis will result in what movements?

- extension, lateral flexion, and rotation of the cervical spine
- bilaterally they act to extend the neck

14

What is the innervation of the semispinalis cervicis?

dorsal rami of C6-C8 spinal nerves (cord levels C6-C8)

15

What osseous parts of the vertebral column serve as an origin to the semispinalis capitis?

- transverse tubercles of C7, T1-T6 or T7
- articular processes of C4-C6

16

What is the insertion for the semispinalis capitis?

below the superior nuchal line of occipital bone

17

Contraction of the semispinalis capitis will result in what movements?

- turns the face to the ipsilateral side of rotation
- bilaterally they act to extend the head (the neck inadvertently)

18

What is the innervation of the semispinalis capitis?

dorsal rami of C1-C6 spinal nerves (cord levels C1-C6)

19

The semispinalis capitis and spinalis capitis may fuse to form what muscle?

biventer cervicis

20

What regional subdivisions are now identified with the multifidis muscles? What are their Latin names?

- lumbar multifidis - multifidis lumborum
- thoracic multifidis - multifidis thoracis
- cervical multifidis - multifidis cervicis

21

What osseous parts of the vertebral column serve as an origin to the classic multifidis?

- articular process of C4-C7
- transverse processes of T1-T12
- mammillary processes of L1-L5
- dorsal surface of S1-S4 or S5

22

What non-vertebral column site serves as an origin to the classic multifidis?

posterior superior iliac spine (PSIS) of the innominate bone

23

What is the insertion for the classic multifidis?

spinous process of 3-5 segements above the origin

24

What transversospinalis muscle attaches to articular and mammillary processes along the spine?

multifidis

25

Contraction of the classic multifidis will result in what movements of the vertebral column?

- lateral flexion and rotation of the spine
- maintains the lumbar lordotic curve
- prevents entrapment of zygapophyseal capsular ligament during movement

26

What is the innervation of the classic multifidis?

dorsla rami of C3-C8, T1-T12, L1-L5 and S1 spinal nerves (cord levels C3-C8, T1-T12, L1-L5, and S1)

27

What osseous parts of the vertebral column serve as an origin to the multifidis cervicis?

articular process of C4-C7

28

What is the attachment site and most cranial vertebra of insertion for the multifidis?

spinous process of C2

29

Contraction of multfifidis cervicis will result in what movements?

- alters the zygapophyseal capsular ligament response to load distribution
- determines the cervical spine response to injury as evidenced by neck pain
- a significant contributor to postural control of the head and neck

30

What osseous parts of the vertebral column serve as an origin to the multifidis lumborum?

spinous processes of L1-L5

31

What is the insertion for multifidis lumborum?

mammillary process and zygapophyseal capsular ligaments and dorsal surface of S1-S4 or S5

32

Which subdivision of multifidis may demonstrate a reversal of origin-insertion?

multifidis lumborum

33

Contraction of multfifidis lumborum will result in what movements?

- lateral flexion and rotation of the lumbar spine
- maintains the lumbar lordotic curve
- prevents entrapment of lumbar zygapophyseal capsular ligament during movement

34

The thoracic rotators are replaced in the lumbar spine by what muscles?

deep laminar fibers of the multifidis

35

What is characteristic of multifidis innervation?

all fascicles attaching to a specific spinous process are innervated by the nerve of that segement
- example: the L2 spinal nerve terminates on fascicles attaching to the L2 spinous process

36

Which muscles of the spine exhibit a reversal of the expected origin-insertion combination?

- iliocostalis lumborum pars lumborum
- longissimus thoracis pars lumborum
- multifidis lumborum

37

Rotator muscles are typically identified in what region of the spine?

thoracic region

38

What will replace muscles spanning one or two segmental levels in the cervicals and lumbars?

deep layers of the multifidis

39

What is the classic origin of rotator brevis or its homolog?

transverse processes from C3 and each lower vertebra to the dorsal surface of sacrum (C3-C7, T1-T12, L1-L5, sacrum)

40

What is the classic insertion of rotator brevis or its homolog?

spinous process one segmental level above, from C2-C7, T1-T12, L1-L5

41

Where does the rotator brevis originating at C3 insert?

the spinous process of C2

42

What muscle connects a transverse process to the spinous process of the segment above?

rotator brevis

43

Contraction of rotator brevis will result in what movements?

- rotation of the segment of insertion
- bilaterally acts to weakly extend spine

44

What is the classic origin of rotator longus or its homolog?

transverse processes from C4 and each lower vertebra to the dorsal surface of sacrum

45

What is the classic insertion of rotator longus or its homolog?

spinous process two segmental levels above, from C2-C7, T1-T12, L1-L5

46

What muscle connects a transverse process to the spinous process two segments above?

rotator longus

47

Contraction of rotator longus will result in what movements?

- rotation of the segment of insertion
- bilaterally acts to weakly extend spine

48

What innervates the rotators?

dorsal rami at the level of insertion

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