Corpus spongiosum penis - Wikipedia - Corpus cavernosum of the penis
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A corpus cavernosum penis (singular) is one of a pair of sponge-like regions of erectile tissue, which contain most of the blood in the penis during an erection. The corpus spongiosum is the mass of spongy tissue surrounding the male urethra within the penis. It is also called the corpus cavernosus urethrae in older texts.