SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Penis tissue. Coloured scanning electron micro- graph (SEM) of a section through penis tissue. Its sponge-like vascular spaces become filled with blood during a penile erection. The tissue is supplied by afferent arteries and drained by afferent veins. Magnification: x540 at 6x7cm size.
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