Prepuce

The prepuce is an invaginated fold of skin sur­rounding the free extremity of the penis. The outer surface is fairly typical skin, while the inner mucous membrane consists of a preputial layer lining the prepuce and a penile layer cov­ering the surface of the free extremity of the penis. The prepuce of the horse makes a double fold, so two concentric layers surround the penis when it is retracted. The prepuce of the pig has a diverticulum dorsal to the preputial orifice. It accumulates urine, secretions, and dead cells, which contribute to the typical odor of a mature boar.