Penis histology

The penis is the male erectile organ and part of the reproductive system.  Two columns of tissue running along the sides of the penis called the corpora cavernosa fill with blood to cause an erection.
The corpus spongiosum is a column of sponge-like tissue running along the anterior of the penis and ending at the glans penis; it fills with blood during an erection, keeping the urethra — which runs through it — open.
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 virtual microscopy

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