Vertebral plexus

External and internal vertebral plexus. There are four venous vertebral plexuses – two internal and two external. The internal plexuses, plexus venosi vertebrales interni (anterior et posterior) are located in the spinal canal and consist of a series of venous rings, one for each vertebra. In the internal vertebral plexus fall the veins of the spinal cord, as well as vv. basivertebral, leaving the vertebral bodies on their back surface and transporting blood from the spongy substance of the vertebrae. The outer vertebral plexus, plexus venosi vertebrales externi, is divided in turn into two: anterior – on the front surface of the vertebral bodies (developed mainly in the cervical and sacral areas), and posterior, lying on the arches of the vertebrae, covered with deep dorsal and cervical muscles. The blood from the vertebral plexus flows in the trunk through the vv. intervertebrales in vv. intercostales post, and vv. lumbales. In the neck area, outflow occurs mainly in v. vertebralis, which, going along with a. vertebralis, merges into v. brachiocephalica alone or previously connected to v. cervicalis profunda.