"The pelvic splanchnic nerves, also known as nervi erigentes, are preganglionic (presynaptic) parasympathetic nerve fibres that arise from the S2, S3 and S4 nerve roots of the sacral plexus. These nerves form the parasympathetic portion of the autonomic nervous system in the pelvis."
"The pelvic splanchnic nerves are preganglionic nerves that arise from the lateral horn grey matter of the spinal cord at the sacral segments of the S2, S3 and S4. The greatest contribution of these fibres is usually from the S3 nerve."
"The pelvic splanchnic nerves join with one another and ascend to join the ipsilateral inferior hypogastric plexus. The inferior hypogastric plexuses are paired structures that lie on either side of the rectum and contain both sympathetic and parasympathetic fibres. After reaching the inferior hypogastric plexus, the pelvic splanchnic nerves ramify throughout the pelvis and lower abdomen innervating ganglia embedded in walls of the descending and sigmoid colon, rectum, ureter, prostate, bladder, urethra and penis."
"The pelvic splanchnic nerves join with one another and ascend to join the ipsilateral inferior hypogastric plexus. The inferior hypogastric plexuses are paired structures that lie on either side of the rectum and contain both sympathetic and parasympathetic fibres. After reaching the inferior hypogastric plexus, the pelvic splanchnic nerves ramify throughout the pelvis and lower abdomen innervating ganglia embedded in walls of the descending and sigmoid colon, rectum, ureter, prostate, bladder, urethra and penis."