Purpose: We investigated the hypothesis that testicles and scrotal skin undergo morphologic changes that would servethe mechanism of erection and ejaculation. Materials and Methods: Testicular and scrotal skin changes during erection and ejaculation were studied in 9 dogs. Testicular volume was measured by ultrasound, testicular temperature by digital thermometer and testicular vascularity by color duplex Doppler ultrasonography. Dartos muscle activity was studied by electromyography. Results: Testicular volume increased during erection and diminished at ejaculation. Testicular consistency became softer during erection and firmer at ejaculation. During erection and ejaculation the testicles were elevated closer to abdominal wall. Testicular temperature increased in the erectile phase followed by reduction during ejaculation. Doppler ultrasonography recorded increased testicular vascularity during erection and diminished vascularity at ejaculation. A dartos muscle electromyogram exhibited increased activity in the erectile and ejaculatory phases. Conclusion: During erection and ejaculation, testicles underwent changes which apparently serve the erectile and ejaculatory functions of penis.

Keywords:
Testicular temperature, Testicular temperature, digital thermometer, Testicular volume and vascularity, Doppler ultrasonography, Dartos electromyography
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© 2007 S. Karger AG, Basel
2007
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