157. Sacrum and Coccyx 158. Vertebral Ligaments: Lumbosacral Region 159. Vertebral Ligaments: Lumbar Region 160. Spinal Cord and Ventral Rami in Situ 161. Relation of Spinal Nerve Roots to Vertebrae 169. Veins of Spinal Cord and Vertebral Column 176. Lumbar Region of Back: Cross Section 178. Thorax: Surface Anatomy 183. Bony Framework of Thorax