Prenatal Development Flashcards
3 stages of prenatal development
The period of zygote, embryo, fetus
The borrowing of the blastocyst into the lining of the uterus
Implantation
Development of the support system (4 major support structure)
amion, chorion, placenta, umbilical cord
Water tight sac
amion
A membrane that surrounds the amion
Chorion
formed from the lining of the uterus and the chorion
-provide respiration and nourishment
placenta
A soft tube containing blood vessels
umbilical cord
second phase
period of the Embryo
3 cell layers
ectoderm, mesoderm, endoderm
the outer layer becomes the nervous system
ectoderm
the middle layer the becomes the muscle
mesoderm
the inner layer the becomes the digestive system, lungs etc.
endoderm
protects fetal skin
vernix
helps vernix to stick to the skin
lanugo
causes to have small head , thin upper lip
Fetal alcohol syndrome (FAS)
effect include retarded
Fetal alcohol effect
effect of smoking
cleft lip
cleft palate
environmental hazard
radiation
chemical and pollutant
