[Angioarchitechtonics of the intervertebral disks in human fetuses and newborns]

The ingrowth of the blood vessel branches into the area of the intervertebral disk takes place at the end of the second month of the intrauterine life. The primary vascular elements have a shape of stretched vascular loops, which grow into the fibrous ring of the disk from the front, from behind and from the sides. Within the fibrous tissue the blood vessels are disposed in the slit-shaped spaces between the layers of the fibrous ring. Here the vascular network is formed by anastomosing. These networks have the smaller meshes the closer to the central zones of the intervertebral disk. No blood vessel branches have been found in the jelly-like nucleus. Intraorganic vessels of the intervertebral disk do not penetrate the vertebrum body. The connection between the disk vessels and the vessels of the vertebrum body takes place in the field of the perichondrium.