Anatomy Craniosacral outflow is mediated by which of the following nervous system? A Sympathetic postganglionic fibers B Sympathetic preganglionic fibers C Parasympathetic postganglionic fibers D Parasympathetic preganglionic fibers 💡 Explanation Craniosacral outflow is mediated by which of the following nervous system? ✓ Correct Answer: D. Parasympathetic preganglionic fibers