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  1. 126.
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    Ejaculation
    • two-part spinal reflex that involves
    – emission, the movement of the semen into the
    urethra
    – ejaculation proper, the propulsion of the semen out
    of the urethra at the time of orgasm
    – Emission is a sympathetic response, integrated in the
    upper lumbar segments of the spinal cord and
    effected by contraction of the smooth muscle of the
    vasa deferentia and seminal vesicles in response to
    stimuli in the hypogastric nerves
    – The semen is propelled out of the urethra by
    contraction of the bulbocavernosus muscle, a skeletal
    muscle.
    ···
    #155707566 şikayet
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