XI. Intervertebral Disc: Annulus Fibrosus Flashcards
What is unusual about the cervical annulus fibrosus?
it lacks any lamellar or layered organization
What is the appearance of the cervical annulus fibrosis?
a horse-shoe with the anterior margin thick and the lateral margins tapering to the unicinate processes; the posterior margin is thin
What is the organization of the lumbar annulus fibrosus?
it has 12-14 concentric cylindrical lamellae
What is the water concentration in the lumbar annulus fibrosus at birth and after thirty?
birth…..78%; thirty…..70%
What is the consequence of aggregated glycosaminoglycans in the lumbar annulus fibrosus?
the annulus fibrosus will retain water under deformation conditions
Which type of collagen is dominant in the annulus fibrosus?
collagen type I
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 organization 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
