| During a 20 hour passage down the oviduct, the egg becomes surrounded by albumen, the shell membranes, and the shell. |
| In a few species, immature eggs that enter the oviduct are eaten by the developing young. |
| The ovary was grasped with a hemostat, a ligature was placed around the oviduct and blood vessels, and the ovary was removed. |
| When the dominant follicle releases its egg into the oviduct, the ruptured follicle forms a corpus luteum on the ovary. |
| The ostium leads to the second portion of the oviduct, the ampulla, which is the duct's dilated mid-portion where fertilization usually occurs. |
| A thin shell membrane forms in the part of the oviduct known as the isthmus. |
