Embryology

Question 1

Explain difference in timings betw. GA and embryological

Answer 1

Embryological timings are usually about 2 weeks LESS than GA

• this is as the GA time frame begins after the date of the last menstrual period

Question 2

When does most embryological changes occur and what is development measure in?

Answer 2

Most changes occur in the FIRST FEW WEEKS of development

Development is measured in Carnegie Stages

Question 3

Explain the process from preimplantation to the foetus

Answer 3

1. Morula
   • ball of undifferentiated cells
2. Blastocyst
   • trophectoderm (O.L) & fluid-filled cavity
   • epiblast & hypoblast (I.L) [gives rise to ALL tissues]

3.