Male Frog:
The principal reproductive organs for the male frog are a pair of testes. The accessory organs are:
1. Vasa Efferentia
2. Bidder's Canal
3. Collecting Tubules
4. Urogenital Ducts
5. Cloaca
6. Cloacal Aperture
Female Frog:
The principal reproductive organs for the female frog are the ovaries. The accessory organs are:
1. A pair of Oviducts
2. Cloaca
3. Cloacal Aperture
The male frog's testes are found in the upper part of the kidneys near a double fold of peritoneum called mesorchium. There are around 10 – 12 vasa efferentia and once they arise from the testes, they travel through the mesorchium and enter the kidneys on their side. Once in the kidneys, the vasa efferentia open into the bidder's canal and communicate with the urogenital duct. The urogenital duct emerges from the kidneys and then opens into the cloaca. The cloaca is a small, median chamber that allows fecal matter, urine and sperm to pass out into the exterior. When frogs mate, the male climbs on top of the female, this certain position is called amplexus and can last several days. During this time, it causes the female to release her eggs and then the male frog releases a layer of sperm onto the eggs through his cloaca. Also the fertilization process is external. Just like the smaller frogs, each ovary in the female frog is small flat and lobulated throughout the year except during the breeding season. During the breeding season, the wall of the ovary becomes studded having a large number of ovarian follicles. Each of the ovarian follicles contain a developing egg. The ovarian follicles project towards the lumen of ovary and then the ovary enlarges. Each oviduct is a long narrow, highly coiled tube and is divided into three parts in accordance with its structure as well as its functions.
1. Oviducal Funnel
2. Oviduct
3. Ovisac
The frontal end of the oviduct forms a wide oviducal funnel. The oviducal funnel is located on the dorsal side of the lung and also leads into the oviduct. The oviduct is straight and thin. It then becomes highly coiled and thick-walled. The coiled oviduct travels posteriorly along the outer side of the kidney while the hinder portion of the oviduct becomes very thin walled. It is sac-like and is called ovisac. The ovisac opens the posterior end in the dorsal wall of the cloaca through its individual apertures lying anteriorly to the openings of ureters. The cloaca opens to the exterior by a cloacal aperture at the posterior end of the frog's body.
Tadpole:
After metamorphosis and once the tadpole is fully developed they gain control of their reproductive system. In smaller frogs, each ovary is small flat and lobulated, this is also the case in the adult frog throughout the whole year with the exception of the breeding season.
Due to time constraints, we were unable to find a picture which would represent the Reproductive system for our frog.