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Human Reproduction, Vol. 11, No. 6, pp. 1157-1161, 1996
© 1996 European Society of Human Reproduction and Embryology

other

The temporary anatomical structures prominent in the first trimester may be fulfilling exchange functions assigned to the placenta in the second and third trimester

S.M. Docherty, R.K. IIes1, N. Wathen and T. Chard

Departments of Obstetrics, Gynaecology and Reproductive Physiology, St Bartholomew's Hospital Medical College West Smithfield, London EC1A 7BE, UK

Correspondence: 1To whom correspondence should be addressed

The extra-embryonic coelom (EEC) and secondary yolk sac are prominent structures in the gestational sac during the first trimester of human pregnancy, at a time before the definitive placental circulation becomes established. We propose that the EEC and yolk sac play a critical role in the nutrition of early pregnancy, fulfilling exchange functions which are assumed by the placenta at a later stage.

Key words: amniotic fluid/early pregnancy/extra-embryonic coelom/yolk sac


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