The correct words into the sentences regarding the action of pelvic splanchnic nerves are:
1. a) lateral gray horns
g) S2-S4
2. b) reproductive organs
3. c) large intestine
The preganglionic parasympathetic nerve fibers that emerge from the anterior rami of spinal nerves S2-S4 and freely disseminate over the abdominal and pelvic cavities to innervate the abdominopelvic viscera are referred to as the pelvic splanchnic nerves (nervi erigentes).
The primary role of the pelvic splanchnic nerves is to deliver parasympathetic input to the pelvic autonomic ganglia. As a result, the pelvic splanchnic nerves innervate the majority of pelvic organs, including the urine bladder, hindgut, ureter, prostate, urethra.
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