Parietal Layer Of Tunica Vaginalis Testis
The tunica vaginalis is the serous covering of the testis. It is a pouch of serous membrane, derived from the processus vaginalis of the peritoneum, which in the fetus preceded the descent of the testis from the abdomen into the scrotum. The parietal lamina (lamina parietalis) of the tunica vaginalis is far more extensive than the visceral, extending upward for some distance in front and on the medial side of the cord, and reaching below the testis. The inner surface of the tunica vaginalis is smooth, and covered by a layer of simple cuboidal mesothelial cells. The interval between the visceral and parietal laminæ constitutes the cavity of the tunica vaginalis.