implantation & development of foetus

• • after fertilisation in the oviduct,zygote travels towards the uterus while forming a ball of cells - embryo ( 3 days)
  • embryo embeds itself in thick lining of the uterus (implantation). grows n develops
  • a placenta forms where embryo attached: an organ that ensures materials can be exchanged btwn blood of mother n embryo
  • the umbilical cord joins the embryo's blood supply to the placenta
  • embryo surrounded by amniotic fluid which protects embryo by cushioning it from bumps (a fluid made from the mother’s blood plasma) that is held in by the amniotic membrane (amniotic sac)
• label

  A) placenta

  B) uterus

  C) umbilical cord

  D) foetus

  E) amniotic fluid

  F) cervix

  G) vagina

  
• • for the next 9 month, embryo grows in uterus ( gestation period)
  • major development of organs takes place within first 12 weeks - embryo gets nutrients by diffusion thru the uterus lining
  • foetus is when organs are all in place and placenta fully formed
  • the remaining gestation time is used by the foetus to grow bigger