Embryonic Development

What does syncytiotrophoblast do

produce hCG

epiblast and hypoblast together form what

bilaminar embryonic disc

yolk sac does what

produces first germ cells, blood cells and vessels
forms part of digestive tract

forms from hypoblast cells

amnion does what

fluid from mom’s blood:

protects embryo from trauma and drying
maintain temperature
prevents adhesion of body parts

forms from epiblast cells

allantois does what

becomes umbilical vessels/cord

chorion does what

encloses other extraembryonic membranes and embryo

forms chorionic villi and eventually the main part of placenta

formed from cytotrophoblast

rearrangement of cells of bilaminar embryonic disc

gastrulation

Germ layers turn into…

Ectoderm - epidermis

Mesoderm - dermis

Endoderm - GI Tract

Chorionic villi penetrate the uterine blood vessels to form

Lacunae; which merge to form Placental Sinus