Trimesters

3 trimesters - 9 months each trimester = 3 months

Germinal Period

Where implantion takes place

Embryonic Period

2-8 weeks after conception cells form, organs appear three supporting layers

Layers of the Embryo

1. endoderm inner layer digestive and respiratory
2. mesoderm middle layer circulatory system bones, muscles, reproductive system
3. ectoderm outer layer nervous system sensory organ skin brain hair

Foetal Period

life support systems

1. amnion
2. umblical corc
3. placenta

Amnion

bag/sac like contains amniotic fluid where embryo floats homeostasis -> temp, humidity shockproof

Umblical cord

2 arteries and 1 vein connects placenta and baby

Placenta

Support system for baby disc shaped supplies necessary nutrients and other material needed takes away toxic waste from the processes (digestive)