PRENATAL DEVELOPMENT

1
PRENATAL DEVELOPMENT

• BIRTH REVIEW

2
GESTATION(the developmental time spent in utero,
lasts for 9 calendar months or 10 lunar months or
40 weeks)
3
PERIODS OF PRENATAL DEVELOPMENT

• GERMINAL
• AND
• EMBRYONIC

4
GERMINAL PERIOD

• BEGINS WITH CONCEPTION AND LASTS 2 WEEKS
• ZYGOTE UNDERGOES RAPID CELL DIVISION
• BLASTOCYST--INNER LAYER OF CELLS THAT DEVELOPS
  INTO EMBRYO
• TROPHOBLAST--OUTER LAYER OF CELLS THAT DEVELOPS
  INTO PLACENTA

5
GERMINAL PERIOD

• BLASTOCYST ATTACHES TO THE UTERINE WALL 6-7 DAYS
  AFTER CONCEPTION
• BLASTOCYST IS COMPLETELY EMBEDDED IN THE UTERINE
  WALL 10-15 DAYS AFTER CONCEPTION
• IMPLANTATION OF BLASTOCYST IN UTERINE WALL MARKS
  THE END OF THE GERMINAL STAGE