APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -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 fibers is usually from the S3 nerve.

Detailed explanation-2: -The pelvic splanchnic nerves (also called nervi erigentes) are the preganglionic parasympathetic nerve fibers that arise from the anterior rami of spinal nerves S2-S4 and freely distribute across the abdominal and pelvic cavities to innervate the abdominopelvic viscera.

Detailed explanation-3: -There are five types of splanchnic nerves on both sides of the spinal vertebrae, including cardiopulmonary, thoracic splanchnic, lumbar splanchnic, sacral splanchnic, and pelvic splanchnic nerves. The splanchnic nerves arise from within the sympathetic thoracic trunk to innervate the abdomen.

Detailed explanation-4: -They contain both preganglionic parasympathetic fibers as well as visceral afferent fibers. Visceral afferent fibers go to spinal cord following pathway of pelvic splanchnic nerve fibers.