The sperm of Amphibia find their way relatively easily to the outside. First, fine tubules connected directly to the testes (T) (Fig. 2) lead through a part of the kidney reserved for the passage of sperm. Then the sperm duct (S = Wolffian duct) takes the sperm and leads them to the cloaca (Cl) and urinary bladder (UB) whence they can reach the outside. The eggs, in comparison, must complete a much more eventful and obstacle-ridden course within the body of the mother.
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