There really isn't a pat answer for this question because the reproductive physiology differes from species to species. In most snakes, the right oviduct is the primary ovary with the left oviduct being greatly reduced and in some cases absent. In snakes that possess a functioning left oviduct, most offspring will be produced in the right oviduct. The oviducts can be broken down into 5 different sections or regions, the infundibulum, tuba uterina,isthmus, uterus and vagina. The oviducts are attached to the doesal wall by mesotubaria. The oviduct itself is comprised of three layers, starting from the outermost layer: the tunica serosa (perimetrium), the tunica muscularis (myometrium), and the tunica mucosa (endometrium). Blood supply is provided by the outer layer. The eggs are moved down the oviduct by peristalsis from the musculature in the middle layer, stimulated by estrogen production during vitellogenisis. Cilial cells in the innermost layer assist movement of spermatazoa to the fertilization site.

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