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Other Terms: Tunica vaginalis testis
The tunica vaginalis is a serous sac that holds the testicle, and part of the head and body of the epididymis, and extends upward into the spermatic cord for one centimeter (three-eighths of an inch). It is the lower and unobliterated portion of the processus vaginalis of the peritoneum and descends into the scrotum just in front of the testicle. It acts as a bursa for the protection of the testicle and the head of the epididymis. There are two parts of the tunica vaginalis: the parietal layer and the visceral layer.
Tunica vaginalis testis