Neurophysiology Ejaculation

The mechanism of ejaculation is conveniently divided into two phases, emission and expulsion.

Emission: During the emission phase, semen (e.g., sperm and seminal fluids) is deposited into the posterior urethra through contractions of the smooth muscles of the vasa deferentia, seminal vesicles, and prostate. At the same time, the internal sphincter of the urinary bladder is closed, thereby preventing retrograde passage of the semen into the bladder. The closure of the sphincter also prevents urine from mixing with the semen. Emission and bladder neck closure are mediated through the thoracolumbar sympathetic system. It is suggested that the sensation of ejaculatory inevitability parallels the emission phase.

Expulsion (or true ejaculation): Emission is immediately followed by expulsion. During expulsion, the semen is forcefully propelled along the urethra and out of the penis by clonic contractions of the striated bulbar muscles of the urethra and contractions of the striated muscles of the pelvic floor (mainly bulbospongiosus muscles).

Expulsion is mediated by the somatic nervous system. Orgasm is associated in timing with the expulsive phase.

5 Secrets to Lasting Longer In The Bedroom

5 Secrets to Lasting Longer In The Bedroom

How to increase your staying power to extend your pleasure-and hers. There are many techniques, exercises and even devices, aids, and drugs to help you last longer in the bedroom. However, in most cases, the main reason most guys don't last long is due to what's going on in their minds, not their bodies.

Get My Free Ebook


Post a comment