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Lernmaterialien
Fertilization and first cleavage take place in
the oviduct
Cleavage pattern of mammals
Rotational holoblastic
Inner cell mass (ICM)
cells are connected by gap junctions
gives rise to embryo
external cells mainly become trophoblast cells
Chorion
embryonic part of placenta
is formed from trophoblast
Epiblast forms
embryo
Hypoblast forms
Yolk
4 extraembryonic membranes
amnion
chorion
allantois
yolk sac
Amnion
cavity around embryo and secretes amniotic fludi to prevent desiccation
Chorion
outermost membrane, gas exchnage
in mammals forms placenta
Allantois
sac to store urinary waste
yolk sac
first extraembryonic membrane formed
mediates nutrition on developing birds and reptiles
Embryonic development in mammals takes place within
the uterus where a placenta is developed for supply of the embryos
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