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Flashcards in Fertilization and Implantation Deck (33):
1

What is the first stage of embyrogenesis

cleavage

2

what does zygote produce during cleavage

morula

3

when does first cell division occur

36 hours after fertilization

4

what comes after morula

blastula

5

what does a trophoblast become

chorion

6

what is chorion

zygote contribution to placenta

7

what becomes the embryo

inner cell mass after formation of trophoblast

8

Embryogenesis steps

cleavage, morula, blastocyst, trophoblast, embryo

9

when does blastocyst implant in uterus

week after fertilization

10

what does blastocyst consist of

trophoblast and embryo

11

what is trophoblast

ring of cells on blastocyst surrounding a cavity

12

when is hCG essential for maintenance of endometrium

first trimester or three months until placenta develops

13

what is role of hCG

substitute for LH in maintaining corpus luteum

14

what is role of corpus luteum

maintain endometrium

15

amnion

fluid filled cavity containing embryo

16

yolk sac

first site of rbc synthesis in developing embryo

17

allantois

develops from embryonic gut and forms the blood vessels of the umbilical cord

18

function of umbilical cord

transport blood between embryo and placenta

19

amnion, yolk sac, and allantois come from where

inner cell mass of blastula

20

gastrulation

when the three primary germ layers become distinct

21

what are the three primary germ layers

ectoderm, mesoderm, and endoderm

22

Endoderm

inner layer

23

Ectoderm

outer layer

24

Mesoderm

develops from endoderm

25

blastopore gives rise to which structure

anus

26

The ectoderm forms which structures

entire nervous system, cornea and lens, epidermis, nasal, oral, and anal epithelium

27

endoderm forms which structures

gi tract epithelium, liver, pancreas, respiratory epithelium, urinary bladder, epithelial lining of urogenital organs and ducts

28

mesoderm structures

muscle, bone, and connective tissue. cardiovascular system, lymphatic system, kidneys, blood, ureters, gonads, reproductive ducts, dermis of skin

29

what comes after gastrulation

neuralation

30

neuralation

formation of nervous system

31

when does neuraltion occur

when ectoderm differentiates into neural plate

32

When are all major organ systems present

8 weeks embryo is now fetus

33

during which trimester are organs being formed

first trimester