Timeline of key stages: embryonic, foetal, neonatal development Flashcards
What period of weeks is considered embryonic development?
Weeks 1-8
What period of weeks is considered foetal development?
Weeks 8-birth
What period of weeks is considered neonatal development?
First 4 weeks (month) after birth
What are the 2 main processes in the first week of development?
Fertilisation
Implantation
On what day of development does fertilisation occur?
Day 1, Week 1
On what day of development does the morula form?
Day 4, week 1
On what day of development does the blastocyst form?
Day 5, week 1
Around what day of development does the trophoblast of the blastocyst form 2 layers?
Day 6.5, week 1
On what day of development does implantation of the blastocyst occur?
Day 6, week 1
On what day of development does formation of the bilaminar germ disc occur?
Day 8, week 2
On what day of development does formation of the amniotic cavity occur?
Day 8, week 2
On what day of development does formation of the primary yolk sac occur?
Day 8, week 2
In what week of development does the trilaminar germ disc form?
Week 3
In week 3, what 3 structures develop as well as the trilaminar germ disc?
Primitive streak, notochord, neural tube
In what weeks does somitogenesis occur?
Weeks 3-8
In what weeks do primitive major organ systems form?
Weeks 3-8
At the end of the embryonic development period, what range of function should all organ systems have?
Minimal function
In foetal development period, what happens to tissues and organs?
They mature
In foetal development period, what is the rate of growth of the foetal body?
Rapid growth of foetal body
