Like the meniscus, the disk has a relatively poor blood supply and what exists enters from the periphery.
There is no direct vessel to the central disk. Small vessels penetrate the outer ring of the anulus fibrosus. Nutrition of the inner disk, thus, is by diffusion. The nerve supply to the disk comes from the sinuvertebral nerve and the gray ramus communicans. Like the blood vessels, free nerve endings do not penetrate deeply.