Composition and composition of the egg.. External tissue in the ovary wall called placenta (cells) and adhesion to the placenta through the umbilical cord

Composition of the egg:
Composed of external tissue in the ovary wall called placenta (cells). The egg attaches to the placenta through the umbilical cord.
Composition of the egg:
Composed of:
1- a fetal sac (with two auxiliary cells, the egg cell (the female nucleus) and two polar nuclei and cytotoxic cells).
2- slot opening.
3- the envelope of the egg.
4- Neusila.
5- Placenta.