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Biology of Reproduction, Vol 12, 289-292, Copyright © 1975 by Society for the Study of Reproduction
1 School of Veterinary Medicine, Auburn University, Auburn, Alabama 36830 A needle-tipped catheter was implanted in the corpus spongiosum penis (CSP) of mature male goats
to determine the pressure during coitus. Electromyographic (EMG) electrodes were also implanted in
the ischiocavernosus (IC) muscles and bulbospongiosus (BS) muscles to monitor their activity. During
coitus the mean peak CSP pressure was 1031 mm Hg and this peak occurred during the ejaculatory
thrust immediately after the peak corpus cavernosum penis pressure. Anesthesia of the BS muscles
significantly reduced the peak CSP pressures of the coital period; however, it did not change the normal,
precoital, and postcoital pressures. The EMG activity of the BS muscles was in phase with CSP pressure
peaks.
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