Which serous membrane surrounds the testis with visceral and parietal layers?

• A. Tunica vaginalis
• B. Tunica albuginea
• C. Tunica vasculosa
• D. Cremasteric fascia

Answer: (A)

This is about the serous membranes surrounding the testis. The tunica vaginalis is a serous sac that envelops the testis and epididymis and has two layers: a visceral layer that covers the testis, and a parietal layer lining the inner wall of the scrotal cavity. They enclose a potential space that normally contains a small amount of fluid to minimize friction during movement. This membrane develops from the peritoneum as the testes descend (processus vaginalis).

The other structures are not serous membranes: the tunica albuginea is the tough fibrous capsule directly on the testis; the tunica vasculosa is the vascular layer under the tunica albuginea; and the cremasteric fascia is part of the spermatic cord, not a serous membrane.