Answer :
The migration of the testes from the peritoneal cavity into the scrotal sac brings a portion of the peritoneum with it. This structure forms the D. Tunica vaginalis.
The pouch of serous membrane that protects the testicles is called the tunica vaginalis. It derives from the peritoneum's vaginal process, which in a foetus occurs before the testes descend from the abdomen into the scrotum.
The lower portion of the pouch, which invests the surface of each testis and is reflected on to the internal surface of the scrotum, remains as a shut sac and may therefore be described as consisting of a visceral and a parietal lamina after its descent. The portion of the pouch that extends from the abdominal inguinal ring to close to the upper part of the gland becomes obliterated after its descent.
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