1 — Anterior external vertebral venous plexus; 2 — Lumbar veins; 3 — Left ascending lumbar vein; 4 — Spinal nerve; 5 — Spinal dura mater; 6 — Inferior vena cava; 7 — Extradural space; Epidural space; 8 — Spinal arachnoid mater; 9 — Anterior internal vertebral venous plexus; 10 — Spongy substance; Trabecular substance; 11 — Intervertebral disc; 12 — Basivertebral veins; 13 — Posterior internal vertebral venous plexus; 14 — Vertebral venosus plexus (anastomosis); 15 — Cauda equina; 16 — Mammillary process; 17 — Spinal vein, spinal branch; 18 — Transverse process; 19 — Supraspinous ligament; 20 — Interspinous ligaments; 21 — Posterior external vertebral venous plexus; 22 — Inferior articular process
