Embryology: principles & fertilisation

Question 1

what are weeks 0-3 in utero called

Answer 1

conceptus/embryo

Question 2

what are weeks 3-8 in utero called

Answer 2

embryonic

Question 3

what are weeks 4-49 called

Answer 3

foetal

Question 4

what is spermatogenesis and how long is one cycle

Answer 4

= generation of sperm

approximately 53 days

Question 5

what is oogenesis and when does it begin

Answer 5

= generation of ovum(eggs)

begins by 28/30th week of gestation

Question 6

describe what fertilisation is

Answer 6

sperm and oocyte fuse to form zygote

Question 7

what is a zygote

Answer 7

single cell diploid embryo

Question 8

where does fertilisation typically occur

Answer 8

the ampulla

Question 9

what is the first step of fertilisation

Answer 9

sperm binds ZP3(zona pellucida glycoprotein 3)

releasing acrosomal enzymes

Question 10

what is the second step of fertilisation

Answer 10

egg and sperm membranes fuse and sperm contents enters egg

Question 11

what does the egg and sperm membranes fusing(fertilisation) trigger in the egg

Answer 11

oocyte to complete meiosis II

release of cortical granules by oocyte(ZP impenetrable to other sperm)