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Biology of Reproduction, Vol 7, 365-369, Copyright © 1972 by Society for the Study of Reproduction
1 Auburn University, Auburn, Alabama 36830 Sexually mature male goats were used to study the hemodynamics of penile erection.
Contrast medium was injected into the internal pudendal artery and serial angiographs of the
erection, and detumescence phases of the erection cycle. The flow of contrast medium injected after erection by electrostimulation was blocked at the caudal edge of the ischial
arch just proximal to the origin of the deep arteries of the penis. It is suggested that the major
valvular mechanism that makes the corpus cavernosum penis a closed system during erection
is a mechanical compression of the internal pudendal arteries, deep arteries of the penis external to or within the tunica albuginea of the crus, and veins against the ischium by contraction of the ischiocavernosus muscles.
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