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Unformatted text preview: plateau phase. Orgasm is a short but intense reaction that usually lasts for 3 - 15 seconds. It is usually accompanied by ejaculation . In the male, ejaculation is actually two independent events -- emission and expulsion . Emission During emission, the sympathetic nervous system stimulates muscular contraction that propel sperm through the duct system. Peristaltic contractions of the ductus deferens moves sperm from the tail of the epididymis into the ampulla. Contractions of the ampulla propel the sperm into the prostatic urethra. The prostate gland contracts and adds prostatic secretions to the semen; secretions of the seminal vesicle join the semen soon after. These events often result in the sensation that ejaculation is imminent....
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- Fall '10