Final Intervertebral Disc Annulus Fibrosus Flashcards
What cell type is associated with the annulus fibrosus
Fibroblast and fibrocyte
What compensates for the thinness of the posterior part of the cervical annulus fibrosus
Posterior longitudinal ligament
What is the organization of the lumbar annulus fibrosus
It has 12-14 concentric cylindrical lamellae
Why is the posterior part of the lumbar annulus fibrosus more susceptible to rupture, herniation, prolapse, or protrusion
The posterior margin of each lamellae is thin and the posterior longitudinal ligament is also less developed
What is the water concentration in the lumbar annulus fibrosus at birth and after 30
Birth: 78%
After 30: 70%
What is the organizational pattern for Glycosaminoglycans in the lumbar annulus fibrosus
They typically have a binding site for hyaluronic acid and are thus aggregated
Which type of collagen is dominant in the annulus fibrosus
Collagen type II
What is the organizational pattern for collagen fibers in the annulus fibrosus
They are parallel with one another in a single lamellus and angled
What is the organizational of collagen fibers between lamellae
Collagen fibers will be angled in the opposite direction such that a spiral counterspiral organization is observed
What is the average angle of collagen fibers within the annulus fibrosus
They average 50 to 60 degrees
What is the attachment site for collagen fibers within the annulus fibrosus
Collagen fibers of the outer lamellae will become sharpeys fibers and penetrate the epiphyseal rims
Collagen fibers of the inner lamellae will attach to the cartilaginous end plate
What is the origin for the cells of the annulus fibrosus
Sclerotomites
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
