Connecting stalk

Connecting Stalk is a structure in embryology that connects the developing embryo to the chorion, an outer layer that interacts with maternal tissues to form the placenta. The connecting stalk later forms the umbilical cord.

Structure

The connecting stalk is a structure that forms during the third week of embryonic development. It is initially located on the ventral side of the embryo, but as the embryo folds, it moves to a position at the base of the umbilical cord. The connecting stalk is composed of extra-embryonic mesoderm and contains the allantois, a tube that extends from the yolk sac into the connecting stalk.

Development

The connecting stalk plays a crucial role in the development of the placenta. It contains the allantois, which is involved in early fluid exchange between the embryo and the yolk sac. The allantois eventually becomes part of the umbilical cord, which provides the fetus with nutrients and oxygen from the mother's bloodstream.

Clinical Significance

Abnormalities in the development of the connecting stalk can lead to complications such as omphalocele, a birth defect in which organs protrude from the umbilicus, and gastroschisis, a condition where the baby's intestines stick out of the baby's body through a defect on one side of the umbilical cord.

See Also

• Embryology
• Placenta
• Umbilical cord
• Omphalocele
• Gastroschisis

References

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