embryo 3 (wk8)

Question 1

what does umbilical cord come from

Answer 1

connecting stalk

Question 2

what do the tertiary chorionic villi have in them

Answer 2

blood vessels within mesenchymal core

Question 3

how can the mom and fetus exchange substance via blood in week 3

Answer 3

via tertiary chronic villi

Question 4

what does the synctiotrophoblast do to decidual cells

Answer 4

causes apoptosis so they release glycogen and lipids

Question 5

what does the cytotrophoblast turn into

Answer 5

primary chorionic villi (project from lacuna)

Question 6

what does the decide basalis form

Answer 6

the placenta

Question 7

where is the maternal blood found

Answer 7

intervillous spaces

Question 8

vasculogenesis vs angiogenesis

Answer 8

▪ Vasculogenesis → development of brand new blood vessels
from mesoderm

▪Angiogenesis→“sprouting” of blood vessels formed by vasculogenesis
* Connects blood vessels to each other

Question 9

process of vasculogenesis

Answer 9

angioblast –> blood island –> lumen –> blood vessels

• Angioblasts derived from mesoderm develop in specialized regions known as blood islands
  ▪ The blood islands develop lumens and become blood vessels

Question 10

what gives rise to RBCs

Answer 10

angioblasts

Question 11

where do RBCs develop first

Answer 11

The red blood cells develop first in the extra-embryonic vessels
* Allantois, umbilical vesicle vessels

Question 12

which vein does blood return from the tertiary vili back up to embryonic heart

Answer 12

umbilical vein

Question 13

what vein feeds intraemnyronic tissue

Answer 13

cardinal veinsq

Question 14

how does blood flow through the umbilical vesicle (which artery and vein(

Answer 14

vitelline artery and vein

Question 15

what happens to the paired heart tubes in week 4

Answer 15

fused and create 1 ventricle and atrium

Question 16

what is the inflow tract to the heart in week 4

Answer 16

sinus venosus