corpus spon·gi·o·sum -.spən-jē-'ō-səm, -.spän- n the median longitudinal column of erectile tissue of the penis that contains the urethra and is ventral to the two corpora cavernosa
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the blood sinus that surrounds the urethra of the male. Together with the corpora cavernosa, it forms the erectile tissue of the penis. It is expanded at the base of the penis to form the urethral bulb and at the tip to form the glans penis.
Medical dictionary. 2011.