Introduction to embryology

Question 1

what is an oocyte

Answer 1

female germ cell

Question 2

what blastomere

Answer 2

cleaved cells from fertilised ovum

Question 3

in which trimester do most the organs develop

Answer 3

1

Question 4

which trimester does rapid foetal growth occur

Answer 4

3

Question 5

what occurs after zygote is formed

Answer 5

cleaved to blastomeres

Question 6

what is a fully successive cleavage to a amss of blastomeres called

Answer 6

morula

Question 7

On day 4 when the morula enters uterine cavity, what provides is nutrients

Answer 7

Uterine milk

Question 8

what is the marula surrounded by

Answer 8

zona pellucida

Question 9

at the 32 cell stage what happens to the morula

Answer 9

becomes a fluid filled cavity called the blastocyst cavity

Question 10

what is a blastocyst

Answer 10

Developed blastotocyst cavity

Question 11

briefly define what occurs on day 1

Answer 11

Cleavage of zygote to 2 blastomeres and 2 polar bodies

Question 12

briefy define what occurs on day 2

Answer 12

cleavage of zygote to 4 cells

Question 13

briefy define what occurs on day 3-4

Answer 13

morula

Question 14

briefly define what occurs on day 5

Answer 14

blastocyst

Question 15

During formation of blastocyst which 2 cells populations arise

Answer 15

Embryoblast and trophoblast

Question 16

Define trophoblast

Answer 16

-outer superficial layer forming wall of blastocyst

Question 17

Define embroblast

Answer 17

inner cell mass which develops into the embryo

Question 18

What does the trophoblast develop into

Answer 18

Chorionic sac that surrounds
-foetus
-foetal portion of placenta

Question 19

what is the site of early exchange between mother and child of nutrients and wastes

Answer 19

chorionic sac

Question 20

On the 5th day what hatches from the zona pellucida

Answer 20

blatocyst

Question 21

where does the blastocyst attach 2 days after hatching from zona pellucida

Answer 21

(endometrium) Posterior portion of fundus or body of uterus

Question 22

Around 7th day were more firmly does the blastocyst attach

Answer 22

endometrium eventually burrowing into the endometrium and is surrounded by it

Question 23

How does the blastocyst merge with and burrow into the endometrium

Answer 23

It secretes digestive enzymes that eat away the endometrial lining at the site of implantation.