1. Yolk
The main nutrient of the egg cell for the development of the embryo.
2. Embryonic disk
The yolk membrane is wrapped tightly around the outside of the yolk and serves to protect the yolk.
3. Egg shell
Prevents damage to the egg cells, reduces evaporation of water, exchanges gas through stomata, and has a supportive and protective role.
4, egg white
Provide nutrients and water for embryonic development, but also has the role of protecting egg cells.
5. The air chamber
contains air, which is exchanged with the cells for gases.
6. Tether
The tether plays a role in fixing the yolk and dampening the shock, which facilitates hatching.
Expanded Information
The reproductive organ that produces egg cells is the ovary of the female bird. The ovary contains many immature eggs, which gradually develop and mature in the ovary, maturing one i.e. eliminating one, detaching from the ovary, falling into the body cavity and entering the oviduct.
The mature oocyte produced by the ovary does not possess the structures of albumen, chitin and eggshell when it leaves the ovary, but these structures are present only after the egg is formed into an egg due to the secretory action of the walls of the middle and posterior portions of the fallopian tube as the egg moves through the fallopian tube.
Additionally, fertilization of the egg occurs in the anterior portion of the fallopian tube before the egg cell is coated with proteins, shell membranes, and eggshells, and not in the uterus after the egg cell has been formed into an egg.
Thus, the albumen, shell and eggshell are not structures of the egg cell itself (they are encased in the egg cell as an adaptation of the bird to its mode of oviparous reproduction), but the yolk portion of the egg, which hangs in the center, is the egg cell (by the time the fertilized egg is formed into an egg and laid, the cleavage has progressed to the early blastocyst stage, and the egg has not just one cell, but many cells in it).
Baidu Encyclopedia - Chicken Eggs
Baidu Encyclopedia - Bird Eggs