Introduction to Embryology

Question 1

What are the 3 key stages in human embryology?

Answer 1

1. Germinal or pre-embryonic stage
2. Embryonic stage
3. Foetal stage

Question 2

What are the 7 academic subdivisions of embryology?

Answer 2

1. General embryology
2. Systemic embryology
3. Comparative embryology
4. Biochemical embryology
5. Experimental embryology
6. Teratology
7. Clinical embryology

Question 3

What 3 things does the germinal or pre-embryonic stage comprise of?

Answer 3

1. Gametogenesis and fertilization (pre-zygotic)
2. Pre-implantation (1st week post fertilization)
3. Week 2 of twos (bilaminar embryonic disc formation, etc)

Question 4

4 things to note about the embryonic stage

Answer 4

1. Occurs between 3rd to 8th week inclusive
2. Commences with gastrulation
3. Organogenesis
4. Development of foetal membrane

Question 5

3 things to note about the foetal stage

Answer 5

1. Occurs week 9 to 38 +/- 2 weeks
2. Appearance of human features
3. All organs grow bigger and the foetus gains weight