Monochorionic twins
Monochorionic Twins
Monochorionic twins (/ˌmɒnoʊkɔːrɪˈɒnɪk/; from the Greek words 'mono', meaning 'single', and 'chorion', meaning 'outer fetal membrane') are identical twins that share the same placenta. This type of twin pregnancy occurs when a single fertilized egg (or zygote) splits into two after conception.
Etymology
The term 'monochorionic' is derived from the Greek words 'mono', meaning 'single', and 'chorion', which is the outermost fetal membrane in mammals. The term is used to describe the condition where twins share a single chorion and thus a single placenta.
Characteristics
Monochorionic twins are always identical, or monozygotic, as they originate from a single fertilized egg. They share the same genetic material and are of the same sex. Monochorionic twins share a single placenta, which can lead to complications such as Twin-to-Twin Transfusion Syndrome (TTTS) and Twin Anemia Polycythemia Sequence (TAPS).
Related Terms
- Monozygotic twins: Twins who are genetically identical and originate from a single fertilized egg.
- Dichorionic twins: Twins who each have their own chorion and placenta. These twins can be either identical or fraternal.
- Twin-to-Twin Transfusion Syndrome (TTTS): A condition that can occur in monochorionic twin pregnancies, where blood moves from one twin to the other.
- Twin Anemia Polycythemia Sequence (TAPS): A rare complication of monochorionic twin pregnancies, where there is an imbalance in the blood counts of the twins.
External links
- Medical encyclopedia article on Monochorionic twins
- Wikipedia's article - Monochorionic twins
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