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Overview of the Male Reproductive System

Author(s): Center for Educational Outreach, Baylor College of Medicine.

Penis

The urethra is a tube that transfers and drains both the male excretory and the reproductive systems. It runs through the penis and opens to the outside at the tip of the penis. 

The corpus cavernosa (spongy erectile tissues) expands with blood during an erection. The corpus spongiosum (spongy, pliable tissues), prevents the urethra from closing during an erection.