Weeks 2&3

Question 1

week of 2’s

Answer 1

trophoblast differentiates into 2 layers - embryoblast forms 2 layers - 2 cavities form - extramembryonic mesoderm splits into 2 layers

Question 2

trophoblast differentiates into:

Answer 2

cytotrophoblast & syncytiotrophoblast

Question 3

embryoblast differentiates into:

Answer 3

hypoblast & epiblast

Question 4

hypoblast

Answer 4

becomes the primary endoderm

Question 5

epiblast

Answer 5

superior to hypoblast - all 3 primary tissue layers originate from this layer

Question 6

Establishment of uteroplacental circulation:

Answer 6

syncytial lacunae becomes continuous with sinusoids

Question 7

extramembryonic mesoderm

Answer 7

new cells that appear between inner surface of cytotrophoblast & outer surface of exocoelomic cavity

Question 8

extraembryonic mesoderm lining cytotrophoblast & amnion =

Answer 8

extraembryonic somatic mesoderm

Question 9

extraembryonic mesoderm covering the yolk sac =

Answer 9

extraembryonic splanchnic mesoderm

Question 10

somatic mesoderm lines

Answer 10

cytotrophoblast

Question 11

splanchnic mesoderm lines

Answer 11

yolk sac

Question 12

gastrulation

Answer 12

formative process by which all three germ layers form - all layers are formed from epiblast

Question 13

the process of prenotochordal cells invaginating in the primitive pit forms the _____

Answer 13

notochordal process

Question 14

remains of the notochordal process comprise the _____

Answer 14

notochordal plate

Question 15

this notochordal plate separates from endoderm, folding in to form the _____

Answer 15

notochord

Question 16

recap of notochord formation:

Answer 16

notochordal process –> notochordal plate –> notochord

Question 17

vasculogenesis

Answer 17

blood vessels arise from blood islands

Question 18

angiogenesis

Answer 18

blood vessels sprouting from existing cells