ARTHOLOGY OF THE VERTEBRAL COLUMN - intervertebral disc Flashcards Preview

Spinal Anatomy Exam 3 > ARTHOLOGY OF THE VERTEBRAL COLUMN - intervertebral disc > Flashcards

Flashcards in ARTHOLOGY OF THE VERTEBRAL COLUMN - intervertebral disc Deck (36):
1

In the fetus, which vertebral levels will demonstrate intervertebral discs?

those between C2 and Co1 inclusive

2

What is the number of true intervertebral discs identified in the adult?

twenty-three

3

In the adult, which vertebral levels will demonstrate a true intervertebral disc?

those between C2 and S1 inclusive

4

What is the percent of intervertebral disc height contribution to the length of each region of the vertebral column?

cervical 22-25%
thoracic 20%
lumbar 33%

5

What si the effect of aging on the intervertebral disc nucleus pulposus?

it becomes more fibrous as water and proteoglycan concentrations diminish

6

What is the cervical nucleus pulposus composed of?

fibrocartilage

7

What is the consequence of non-aggregated glycosaminoglycans in the lumbar nucleus pulposus?

the nucleus pulposus will lose water under deformation conditions

8

What cell is associated with the nucleus pulposus until about age eleven?

notochord cells

9

Which type of collagen is dominant in the nucleus pulposus?

collagen type II

10

What is unusual about the cervical annulus fibrosus?

it lacks any lamellar or layered organization

11

What is the appearance of the cervical annulus fibrosus?

a horse-shoe with the anterior margin thick and the lateral margins tapering to the uncinate processes; the posterior margin is thin

12

What is the organization of the lumbar annulus fibrosus?

it has 12-14 concentric cylindrical lamellae

13

What is the consequence of aggregated glycosaminoglycans in the lumbar annulus givrosus?

the annulus fibrosus will retain water under deformation conditions

14

Which type of collagen is dominant in the annulus fibrosus?

collagen type I

15

What is the organization of collagen fibers between lamellae?

collagen fibers will be angled in the opposite direction such that a spiral - counterspiral organization is observed

16

What is the organizational pattern for collagen fibers in the annulus fibrosus?

they are parallel with one another in a single lamellus and angled

17

What is the average angle of collagen fibers within the annulus fibrosus?

they average 50 to 60 degrees

18

What is the principal type of collagen fiber within the cartilage end plate?

the type II collagen fiber

19

What is the direction of collagen fibers within the cartilage end plate?

collagen fibers are aligned anterior to posterior

20

What cell type is associated with the cartilage end plate?

chondrocytes

21

What is the earliest indicator of intervertebral disc pathology or degeneration?

changes in the histology of the cartilage end plate

22

What part of the intervertebral disc is the "growth plate"

the transition zone

23

What part of the intervertebral disc is innervated?

the outer lamellae of the annulus fibrosus

24

What are the types of receptor endings in the intervertebral disc?

nociceptors and proprioceptors

25

What is the relationship between size of the intervertebral disc and receptor endings

the larger the disc, the greater the variety of receptor endings

26

What is the proposed function of receptor ending density in the anterior part of the intervertebral disc?

they provide feedback during extension

27

What forms the posterior neural plexus of the vertebral column?

the sinu-vertebral nerve (sinus vertebral nerve, recurrent meningeal nerve

28

What forms the anterior neural plexus of the vertebral column?

fibers from the ventral primary ramus

29

What is the name given to the white ramus communicans which becomes embedded within the annulus fibrosus of the intervertebral disc?

the paradiscal ramus communicans

30

What innervates the outer lamellae of the annulus fibrosus at the lateral part of the intervertebral disc?

fibers from the ventral primary ramus, fibers from the white ramus communicans, fibers from the paradiscal ramus communicans, fibers from the gray ramus communicans

31

What structure is formed following migration of sclerotomes to surround the notochord?

the perichordal blastema

32

What is formed within the perichordal blastema between the sclerotomites?

the intrasclerotomal fissure or fissure of von Ebner

33

What does the intrasclerotomal fissure or fissure of von Ebner become?

the perichordal disc

34

What part of the intervertebral disc will the notochord form?

the nucleus pulposus

35

What part of the intervertebral disc will the perichordal disc form?

the annulus fibrosus

36

What is the earliest indicator of the position of the adult intervertebral disc?

the intrasclerotomal fissure or fissure of von Ebner