Mature eggs pass from the oviduct along the ovipositor to be placed between leaves, along with an adhesive that attaches the eggs to the leaves and keeps the leaves together.
A special gland in the female, unique to elasmobranchs and known as the oviducal , nidamental, or shell gland, produces the egg case.
The innermost parts of these ducts remain separate, and become the Fallopian tubes, or oviducts ; the lower parts fuse, and develop into the uterus and vagina.
Further, no emigrating females had oviductal eggs, suggesting total reproductive failure during that year.
The paired eggs suggest that these dinosaurs retained two functioning ovaries and oviducts , each producing a single egg at a time.
In females, in the absence of the testes, the Müllerian ducts develop into the oviducts , which transport eggs from the ovaries to the uterus, while the Wolffian ducts degenerate.
Several studies have shown that mammalian embryos, exposed in vivo to hyperosmotic oviductal fluids, grow better in vitro in hyperosmotic media when provided organic osmolytes.
Thus, it is puzzling that Great Tits had about twice as much oviductal sperm.
In Afrixalus, the leaf-folding frog, mating pairs construct an over-water leaf nest by folding leaves together with their legs, and gluing them together with oviducal secretions.
Furthermore, estrogen was found to inhibit PAI1 protein synthesis in oviductal cells.