DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Colour enhanced photomicrograph of specialized veins of the penis believed to be involved in the hemodynamics of erection. Cross section through a circumflex vein at the proximal end of the corpora cavernosa, showing thick muscular pollsters. Magnification 350x at approximately 4.5x3 inches.
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