[TA] visceral branches from the ventral primary rami of the second, third, and fourth sacral spinal nerves that join the inferior hypogastric plexus to form the pelvic plexuses, to and from which they convey presynaptic parasympathetic and sensory fibers, respectively. SYN: nervi splanchnici pelvici [TA], radices parasympathicae gangliorum pelvicorum* [TA], parasympathetic root of pelvic ganglia*, nervi erigentes.