Female Reproductive Tract Ovary Infundibulum - site of fertilization Magnum - albumin addition Isthmus - membranes Uterus - shell gland Vagina - transport to exterior Sperm storage occurs at various sites in tract in some species
Animal StructuresFemale Genital: A female reproductive Systemis usually composed of a pair ofovaries and a pair of oviducts.Chickens and most other birds haveonly one ovary and one oviduct.Ovary: Organ in which yolk formation occurs; yolkis formed in the follicular sac ovarian follicleby the deposition of continuous layers of yolkmaterial; ninety-nine percent of the yolkmaterial is formed within the 7-9 days beforethe laying of the egg.
Oviduct: The egg moves through the oviduct for about 22 hours.During this journey it undergoes a number of modifications. First, athickened outer layer is applied to the vitelline membrane, whichhas two cord-like extensions, chalazae, which anchor the yolk incenter of the egg and stabilize it. Infundibulum: Also called funnel; the first section of the oviduct that quickly engulfs the yolk with its thin, funnel-like lips.
Magnum: After passing the infundibulum the yolk quicklyenters the magnum section. The albumen is applied tothe outer surface of the egg providing water, nutrients,and antibiotic agents. The shape of the egg is largelydetermined in this section. The magnum is separatedfrom the isthmus by a narrow, translucent ring withoutglands.
perivitelline Infundibulum Ovary membraneAvianFemale chalazaeAnatomy albumenMagnum Oviduct shell membraneIsthmus Shell Gland Uterus Intestine cleaving blastodisc 24 hrs 50K cells vagina Right Oviduct cloaca shell Left side of Reproductive Tract Develops!!
Isthmus: Isthmus is smaller in diameter than the magnum.It is here the two shell membranes are added. Themembranes touch each other throughout the egg,except at the blunt end of the egg, where the air cellis formed later because the egg content cools downand contracts after laying.
Uterus: Also called shell gland. In this portion of the oviduct, calcite crystals are deposited in and over the outer shell membrane layer to form the eggshell.Vagina: In the vagina, a thin, protein coating called "bloom" is applied to the shell to keep harmful bacteria or dust from entering the egg shell pores. The egg is turned horizontally (the process called oviposition) just before laying so that egg will exit with blunt end first.