前列腺小囊(prostatic utricle),又稱為男性陰道(vagina masculina),是位於男性前列腺尿道後壁精阜中央的小凹陷。射精管開口於其下方兩側。
前列腺小囊沒有生理功能,與女性生殖系統中的子宮和上陰道為同源器官,是中腎旁管[1]遠端的胚胎遺蹟,不過這一點存有爭議。[2]
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