Embryology COPY

Question 1

What happens in the germinal phase, and for how long?

Answer 1

Germinal phase (14 days):

Mitosis of cells to form zygote, morula and blastocyst.

Day 1 - Fusion of haploid gametes to form a diploid zygote.

Day 4 - Post fertilisation, blastocyst implants into the uterine wall.

Question 2

What happens in the
Embryogenic phase and for how long?

Answer 2

Embryogenic phase (2-10 weeks):

Cells start to develop and mature into the systems of the body:

• Gastrulation, Nervous system, Cardiovascular system, organs and limbs.

Question 3

What happens in the foetal phase, and for how long?

Answer 3

Foetal phase (last 10 weeks - 9 months)

Characterised by growth and development of the organs and the foetus.

Question 4

How many weeks is human gestation (pregnancy)?

Answer 4

40 weeks