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Three-dimensional visualization reconstructed from scanned human data. Anteriolateral view of the flaccid penis; also shown are the testicles vasa deferentia and the bladder which sits snuggly behind the pelvis.. There are three columns of erectile tissue in the penis: at the top (or dorsal side) of the penis are the two corpora cavernosa and at the bottom (or ventral side) is the corpus spongiosum. Upon arousal the arteries that supply the penis dilate and allow blood to fill the three spongy erectile tissue columns causing it to lengthen and stiffen. The engorged erectile tissue presses against penile veins preventing blood from flowing back out of the penis. 2 of 2.
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