Tunica Vaginalis of Animals

Tunica Vaginalis of Animals

Tunica vaginalis of Animals is an evagination of parietal peritoneum passing through the inguinal canal into the scrotum. When fully developed, it has the shape of a flask with narrow proximal part and a distended distal part

The proximal part contains the spermatic cord and the distal part has the testis and epididymis. Like the peritoneum, tunica vaginalis also consists of two layers – parietal and visceral. The parietal layer lines the scrotum and inguinal canal and is continuous with the parietal layer of peritoneum at the abdominal inguinal ring. The visceral layer lines the spermatic cord, testicle and epididymis.

The space between the parietal and visceral layers of the tunica vaginalis, which is a capillary space, contains a small quantity of serous fluid.

This cavity is continuous with the general peritoneal cavity at the abdominal inguinal ring