Intervertebral Disc: Annulus Fibrosus Flashcards Preview

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Flashcards in Intervertebral Disc: Annulus Fibrosus Deck (13)
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1
Q

What is the appearance of the cervical annulus fibrosus?

A

A horse-shoe with the anterior margin thick and the lateral margins tapering to the uncinate processes
Posterior margin is thin

2
Q

What compensates for the thinness of the posterior part of the cervical annulus fibrosus?

A

Posterior Longitudinal Ligament

3
Q

What is the organization of the lumbar annulus fibrosus?

A

It has 12-14 concentric cylindrical lamellae

4
Q

What is the water concentration in the lumbar annulus fibrosus at birth and after 30?

A

Birth: 78%
30: 70%

5
Q

What is the organizational pattern for glycosaminoglycans in the lumbar annulus fibrosus?

A

They typically have a binding site for hyaluronic acid and are thus aggregated

6
Q

Which type of collagen is dominant in the annulus fibrosus?

A

Collagen type I

7
Q

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

A

They are parallel with one another in a single lamellas and angled.

8
Q

What is the organization of collagen fibers between lamellae?

A

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

9
Q

What is the attachment site for collagen fibers within the annulus fibrosus?

A

Collagen fibers of the outer lamellae will become Sharpey’s fibers and penetrate the epiphyseal rims.
Collagen fibers of the inner lamellae will attach to the cartilaginous end plate

10
Q

What is the origin for the cells of the annulus fibrosus?

A

Sclerotomites

11
Q

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

A

Type II collagen

12
Q

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

A

Anterior to Posterior

13
Q

What is the attachment site for collagen fibers of the inner lamellae of the annulus fibrosus?

A

Cartilaginous End Plate

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