Ejaculation is a neurological double reflex: The afferent reflex begins by stimulating penis receptors, then those stimulus travel through dorsal to pudendal nerves, sacral cord and finally to the hypothalamus. At the same time stimulation from the uretra goes to the ejaculatory centers located on segments S2-S4 .The efferent reflex is a response from the hypothalamus centers to parasympathetic nerves and ganglia. Those actions result in release of neurotransmitters, which depolarize perineal muscles, deferents, seminal vesicles, prostate and uretra muscles, and begin rhythmic contractions and seminal emission.
Conflict of Interest: None disclosed
Financial Support/Funding: None disclosed
Recorded: Sydney, Australia, April 2007