Spine and vertebral venus plexus, shown in situ, in 2 numbered illustrations. Spine divided in coronal section at the lamina, spinal cord removed to show spinal canal, venous plexus, ribs (cut) with costotransverse ligaments. 1 illustration shows spine and veins with skull divided coronally through the posterior cranial fossa. Aorta, carotid arteries, superior vena cava, brachiocephalic veins, and sacrum also shown. Anterior view. 1 illustration shows spine from atlas to sacrum, divided coronally at the lamina to show spinal canal, venous plexus, ribs (cut) with costotransverse ligaments. Posterior view.