Dictionary > Monochrorionic-diamniotic twins

Monochrorionic-diamniotic twins

Definition
noun
Twins that share the same chorion but with separate amniotic sacs
Supplement
Twins may be classified according to the degree of separation in utero, i.e. according to chorionicity (placentae) and amniocity (amniotic sac): (1) dichorionic-diamniotic twins, (2) monochrorionic-diamniotic twins, (3) monochorionic-monoamniotic twins, and (4) conjoined twins. In monochorionic-diamniotic (MoDi) twins, the twins share the same placenta and (mostly) are diamniotic, i.e. having two amniotic sacs. This is common in monozygotic twins (i.e. 60-70%).1 MoDi twinning occurs on day 4 to day 8 after fertilization.2 It occurs in 60% to 70% of the pregnancies with monozygotic twins3, and in 0.3% of all pregnancies.4 Thus, most of the MoDi twins are monozygotic twins.
See also:

Reference(s):

1 Curran, Mark (2005-11-02). “Twinning”. Focus Information Technology. Retrieved 2008-10-10.

2 Shulman, L. S. and Vugt, J. M. G. van (2006). Prenatal medicine. Washington, DC: Taylor & Francis. pp. 447.

3Curran, M. (2005-11-02). “Twinning”. Focus Information Technology.

4 Cordero, L., Franco, A., Joy, S. D., & O’shaughnessy, R. W. (December 2005). “Monochorionic diamniotic infants without twin-to-twin transfusion syndrome”. J Perinatol25 (12): 753–8.


You will also like...

Geological Periods
Geological Periods

Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

Kidneys
Kidneys and Regulation of Water and Inorganic Ions

The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..

IQ, Creativity and Learning
IQ, Creativity and Learning

Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

Biological Cell Defense
Biological Cell Defense

Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

A sperm cell fertilizing an ovum
Human Reproduction and Fertilization

For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

Biological Energy
ATP & ADP – Biological Energy

ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..