Timetoast

Fetal Development

By faithtay12
  • Fertilization occurs

    Fertilization occurs

  • Fertilized egg

    Occurs with fertilization and is known as such for the first 12 hours
  • Pronuclei join together (12 hours)

    Pronuclei join together (12 hours)

  • Hour 12

    Zygote stage begins
  • 30 hours

    30 hours

    First round of mitosis {cleavage}
  • 40 hours

    40 hours

    Second round of mitosis

  • Morula formed

  • Embryonic stage begins

    begins when the third cleavage occurs and forms a morula
  • 50 hours

    50 hours

    Third round of mitosis
  • 144 hours (day 6)

    144 hours (day 6)

    64 cell embryo called blastocyte.
  • 192 hours (day 8)

    192 hours (day 8)

    Implantation occurs
  • 240 hours (day 10)

    240 hours (day 10)

    Ectopic pregnancy could occur.

  • 10 days

    Hatching
  • 288 hours (day 12)

    288 hours (day 12)

    Disc with streak on underside forms mesoderm.

  • 288 hours (day 12)

    bCG begins to secrete

  • 360 hours (day 15)

    First missed period
  • 67 hours (day 18)

    67 hours (day 18)

    neural tubes form
  • 139 hours (day 21)

    139 hours (day 21)

    Heart begins to beat, arm and leg buds appear, yolk sac makes RBCs
  • 86 hours (day 34)

    86 hours (day 34)

    face plates begin to form.
  • Week 6

    Week 6

    muscles form, bent neck, webbed hands and feet, segmented back
  • Week 7

    Week 7

    Fingers and toes separate, eyes and ears formed
  • Day 50

    Day 50

    Genitalia begins to differentiate, eyelids fuse, amnion surrounds fetus
  • Week 9

    Week 9

    Chorionic villi sampling could be performed

  • Fetus stage begins

    Occurs when all organs are formed
  • Week 14

    Week 14

    Amniocentesis can be performed
  • 6 months

    6 months

    Eyes open, fat added under skin, head out of proportion to the body