Erectile dysfunction, or ED, means you have trouble getting and keeping the erection
The body of the penis contains three cylindrical masses of tissue. The lower mass is the Corpus Spongiosum, and the two top masses are called Corpora Cavernosa. An elastic fiber sheath called the Tunica Albuginea surrounds all three masses. A cross-section cut of each cylinder looks like a sponge because of the hollow lacunar spaces that fill with blood during an erection.
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