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Where is the corpus spongiosum located in the penis?

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Front view anatomical diagrams of the male and female reproductive systems, with labeled organs including penis, testis, prostate gland, uterus, ovary, and vagina. — human reproductive system Organs and structures of the male and female reproductive systems.

The corpus spongiosum is a cylindrical mass of erectile tissue located in the penis. It is situated in a midline groove on the undersurface of the corpora cavernosa and runs through the center of the body of the penis.12

The urethra passes directly through the center of the corpus spongiosum. The tissue begins at the root of the penis, where it is continuous with the bulb of the penis, and extends forward to the tip, where it expands to form the glans penis. Unlike the corpora cavernosa, which lie above it, the corpus spongiosum reaches beyond the extremities of the corpora cavernosa to form the sensitive, conical structure of the glans.132