SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Blood vessels. Coloured scanning electron micrograph (SEM) of a resin cast of blood vessels from the epididymis of a testis. This network of vessels infiltrates the tissue, supplying it with blood. The epididymis stores sperm as they mature. The cast was made by injecting resin into the blood vessels and then chemically digesting the surrounding tissues.
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