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Dynamic activity of bladder neck and external sphincter in ejaculation

M Koraitim, W Schafer, H Melchior

    Urology
    |August 1, 1977
    PubMed
    Summary
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    The bladder neck exhibits a distinct electromyographic pattern during ejaculation, involving rhythmic contractions and relaxations. This pattern is mirrored by the external sphincter, indicating coordinated muscular activity during this physiological event.

    Area of Science:

    • Urology
    • Neurophysiology
    • Human Physiology

    Background:

    • Ejaculation involves complex neuromuscular coordination.
    • The electromyographic (EMG) activity of the bladder neck and external sphincter during ejaculation is not fully elucidated.

    Purpose of the Study:

    • To characterize the electromyographic (EMG) pattern of the bladder neck during ejaculation.
    • To investigate the relationship between bladder neck and external sphincter EMG activity during ejaculation.

    Main Methods:

    • Electromyography (EMG) was used to record the electrical activity of the bladder neck and external sphincter.
    • Recordings were performed during natural ejaculation in human subjects.

    Main Results:

    • The bladder neck demonstrated a characteristic EMG pattern during ejaculation, with rhythmic alternations of high and low activity.

    Related Experiment Videos

  • This pattern reflects coordinated muscular contraction and relaxation, primarily in the ventral portion of the bladder neck.
  • The external sphincter exhibited a brief period of increased activity preceding a pattern similar to that of the ventral bladder neck.

    • Conclusions:

    • The bladder neck displays a specific, coordinated electromyographic pattern during ejaculation.
    • The external sphincter's activity is temporally related to the bladder neck's EMG pattern, suggesting integrated neuromuscular control.