Which of the following is true with regard to the structure of the anulus fibrosis of the normal intervertebral disc?
A) Annular lamina are oriented 60° to the horizontal plane of the intervertebral disc.
B) It resists tensile forces in all directions.
C) The water and proteoglycans content of the anulus is greater than the collagen content.
D) Anulus is vascular in the adult.

Question

Quizplus · Accepted Answer

The anulus fibrosis is mainly composed of collagen and is designed to resist tensile forces in all directions. This allows the disc to maintain its shape and prevent herniation under compressive loads. The annular lamina are oriented at an oblique angle to the intervertebral disc to provide stability while allowing for some flexibility. The anulus fibrosis is avascular in the adult, meaning it does not have its own blood supply. The water and proteoglycan content of the anulus is lower than the collagen content, making it more resistant to compression than tension.

Which of the Following Is True with Regard to the Structure