Goose egg structure diagram 1. Plastic protective film 2. Eggshell 3. Shell film 4. Inner shell film 5. Air chamber 6. Outer dilution protein 7. Crude protein 8. Internal dilution protein 9. Ligament 10. Egg yolk membrane 1 1. Shallow egg membrane 12. Deep yolk 65438. There is a colloidal protective film outside the eggshell, which can close the pores on the eggshell, limit the evaporation of water in the egg and prevent the invasion of bacteria. But with long-term storage or incubation, the plastic protective film gradually dissolves or falls off. The middle layer of eggshell is a sponge layer, which is a rugged hard shell layer with crystalline minerals deposited on the nipple layer, and has considerable hardness and tolerance. The inner layer of the eggshell is the nipple layer, which is composed of countless small round nipples. It is the most important part of the egg and has a certain strength.
There are many pores on the eggshell, which connect the inside and the outside.