Dating the early pregnancy by sequential appearance of embryonic structures.

  title={Dating the early pregnancy by sequential appearance of embryonic structures.},
  author={William B. Warren and I E Timor-Tritsch and D B Peisner and Srikanth Raju and Mortimer G Rosen},
  journal={American journal of obstetrics and gynecology},
  volume={161 3},
A total of 97 transvaginal scans were performed from 4 to 12 weeks' gestation in normal and accurately dated gestations. The sequential appearance of six structures were examined: (1) the gestational sac only was present during week 4; (2) the yolk sac appeared in week 5; (3) the fetal pole with detectable heart motion was first seen in week 6; (4) the single unpartitioned ventricle in the brain marked week 7; (5) the falx cerebri appeared during week 9; and (6) the appearance and the… CONTINUE READING

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