8 AN ATLAS OF ERECTILE DYSFUNCTION
ORGASM AND EJACULATION
Orgasm and ejaculation are the result of a sudden increase in sympathetic
efferent activity. This has a number of effects: theprostate, seminal
vesicles and vasa deferentia contract, emptying their contents into the
prostatic urethra. The bladder neckcloses tightly to prevent retrograde
ejaculation, and the external urethral sphincter relaxes. Semen is ejaculated in
a pulsatilefashion as a result of rhythmic contractions of the
bulbocavernosus muscles (Figure 27).
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