Cylinder embryo


Cylinder embryo - a rodent-specific structure formed by polar trophoblast (ie trophoblast adjoining the embryonic gut) and embryonic gland.

The embryo cylinder begins to be formed after the blastocyst is implanted. It is caused by the growth of the polar trophoblast outward towards the tissues of the uterus and the inside of the yolk cavity. This part of the polar trophoblast, which has spread to the yolk cavity and the embryonic node that has been pushed into the cavity of the yolk sac, form a rod-shaped embryo called the embryonic cylinder. On the sixth day of development, a cavity appears inside of him and he assumes the shape of a tube closed on both sides. The fetal membranes will form from this part of the trophoblast. The second part will be involved in the production of fetal membranes and will produce the embryonic body. Bibliography

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