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tunica vaginalis

The pouch of serous membrane that covers testes. It forms as the embryological testis descends and passes out through superficial inguinal ring carrying its abdominal peritoneal covering with it. It consists of two layers, the parietal and visceral laminae. The visceral layer covers tunica albuginea of testis, while the parietal level is reflected onto scrotum, covering its inner surface. It secretes a trace quantity of a lubricant into the cavity of tunica vaginalis, which is usually a potential space only, permitting testis to move freely within its scrotum. Pathologically, it is this space that distends with fluid to form a hydrocele.