Cavernous_nerves
The cavernous nerves are post-ganglionic parasympathetic nerves that facilitate penile erection and clitoral erection.[1] They arise from cell bodies in the inferior hypogastric plexus where they receive the pre-ganglionic pelvic splanchnic nerves (S2-S4).
In the penis, there are both lesser cavernous nerves and a greater cavernous nerve.