early embryo Flashcards
what does two layered embryo form from?
inner cell mass. this happens during implantation.
what are the two layers of the embryo?
the epiblast and hypoblast.
what forms from trophoblast?
cytotrophoblast and syncytiotrophobast.
what could blastulas from cleavage turn into?
a full person
where does amniotic cavity begin to form?
between epiblast and cytotrophoblasts
forming primary yolk sac, first stage
migration of hypoblasts to form Heuser’s membrane over cytotrophoblasts of blastocyst cavity
what forms between hypoblasts and cytotrophoblasts in ten days?
the extraembruyonic reticulum
what forms between the reticulum and hypoblasts in 12 days?
the extraembryonic mesoderm
when does chorionic cavity surface?
when the extrembryonic reticulum breaks down in areas betwen the yolk sac adn the outer layer of the extraembryonic mesoderm
bilayered embryo consists of
amniotic cavity and definitive yolk sac
how is bilayered embryo suspended in chorionic cavity?
by thick connecting stalk that becomes umbilical cord
