Embryology Flashcards
A zygote is
a combination of 2 cells, sperm and ova
an embryo is
up to 8 weeks old
a fetus is
past 8 weeks
what is the 16-cell stage of life called
morula
gytogenesis is
development of cells
histogenesis is
formation of cells into tissues
organogenesis
formation of organs from tissues
what 3 layers does the embryo consist of
ectoderm, mesoderm, endoderm
Why does it take 2 weeks after menstruation for the conception to take palce
the ova is not released until ovulation
what is a yolk sac
the pre-placenta that feeds the baby
what is the sirst system to become functional in the embryo? when?
the cardiovascular system. 5-6 weeks
what does the umbilical vein do?
brings oxygenated blood with nutrients from the placenta to the fetus
what do the 2 umbilical arteries do?
they bring deoxygenated blood from the fetus to the placenta
when does the portal vein develop
the eighth embryologic week
