Basic Science

Question 1

stages of fetal development from conception

Answer 1

zygote, morula (16 cells), blastocyst (5 days), gastrula, embryo (5-11weeks), foetus (>12weeks)

Question 2

eukaryotic cell formed by fertilisation between two gametes

Answer 2

zygote

Question 3

blastocyst structure

Answer 3

inner cell mass that becomes the embryo

outer layer of cells called trophoblast that gives rise to the placenta

Question 4

When does implantation usually happen?

Answer 4

day 11-12

Question 5

What is the conceptus?

Answer 5

embryo and all the structures that develop from the zygote (embryonic part of the placenta and its associated membranes)

Question 6

What are the membranes surrounding the developing embryo?

Answer 6

amnion (fills with fluid to become amniotic sac)

chorion (outermost fetal membrane)

Question 7

What are the main functions of the yolk sac?

Answer 7

important in early embryonic blood supply

incorporated into primordial gut development

Question 8

What is merkels diverticulum?

Answer 8

proximal part of the duct persists in about 2% of population

Question 9

What are the three main process that transform zygote into an embryo?

Answer 9

formation of blastocyst
gastrulation (single layered structure becomes multilayered, formation of 3 germ layers ecto, meso, endo)
organogenesis (starts at end of gastrulation and goes until birth, 3 germ layers form internal organs)