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| urethral sponge ： ウィキペディア英語版 |
urethral sponge
The urethral sponge is a spongy cushion of tissue, found in the lower genital area of females, that sits against both the pubic bone and vaginal wall, and surrounds the urethra.
==Functions==
The urethral sponge is composed of erectile tissue; during arousal, it becomes swollen with blood, compressing the urethra, helping prevent urination during sexual activity (along with the pubococcygeus muscle).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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