Physiology of ejaculation

Question 1

What is the physiology of ejaculation? What nerves are involved?

Answer 1

• Sympathetic innervation by the hypogastric nerve (contains pre- and post-ganglionic sympathetic fibers from T10-L2) is responsible for the emission of semen into the posterior urethra. Emission is the first phase of male ejaculation (followed by the second phase, expulsion).[1]
• In contrast, erection is mediated primarily by the parasympathetic nervous system via pelvic splanchnic nerves.