Figure 58-6 Pathways of labor pain illustrating the nerve pathways responsible for pain in the various stages of labor and the types of blocks that can block nerve impulse transmission through these pathways to alleviate labor pain. (Redrawn from Eltzchig HK, Lieberman ES, Camann WR: Regional anesthesia and analgesia for labor and delivery. N Engl J Med 348:319, 2003.)