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Human Development. (If contraception doesn’t work!) . Fertilization. 12 Hours. Cell Membrane. Zygote. 1. Pre-Embryonic Period . After Fertilization but Before Implantation. 36 Hours. 2 weeks. Baby. Placenta. Baby. Implantation. Placenta. Embryonic Period.
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Human Development (If contraception doesn’t work!)
Fertilization 12 Hours
1. Pre-Embryonic Period After Fertilization but Before Implantation 36 Hours 2 weeks
Baby Placenta Baby
Implantation Placenta
Embryonic Period Implantation to Organ Development
Neural Fold ; Neural Groove Nervous System Notocord
Anterior Posterior
Anterior Posterior
Reproductive System ~6 Weeks Y Chromosome XY XX
Fetal Period Organ Development to Birth Allometric Growth