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Primary urethral groove : ウィキペディア英語版 | Primary urethral groove
The primary urethral groove or urethral groove is a temporary linear indentation on the underside (ventral side) of the male penis during embryonic development. In humans, it typically appears around 8 weeks of gestation and becomes closed into a normal male urethra by the 12th week. ==Pathology== Failure of complete closure can be associated with hypospadias.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Primary urethral groove」の詳細全文を読む
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