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Medical Definition of Pelvic splanchnic nerves
1. 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 fibres, respectively. Synonym: nervi pelvici splanchnici, nervi erigentes. (05 Mar 2000)