Multiple Pregnancy / Twin Pregnancy – Varieties

h9991443_001Multiple Pregnancy / Twin Pregnancy – Varieties :

  • Binovular twins   
  • Uniovular twins

Binovular twins (syn: fraternal, dizygotic)

It is the commonest and results from the fertilization two ova, most likely ruptured from two different graffian follicles usually of the same or one from each ovary.

Uniovular twins (syn: identical, monozygotic)

                            Results from the fertilization of a single ovum, twinning may occur at different periods after fertilization and this is markedly influences the process of implantation and the formation of the fetal membranes.