The vertebral venous plexus.
D000767:Anesthesia, Epidural; D000775:Anesthesia, Spinal; D002574:Cervical Vertebrae / Q000098:blood supply; D006801:Humans; D008159:Lumbar Vertebrae / Q000098:blood supply; D012039:Regional Blood Flow; D013131:Spine / Q000033:anatomy & histology / Q000098:blood supply*; D013904:Thoracic Vertebrae / Q000098:blood supply; D014680:Veins / Q000033:anatomy & histology*