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