distingiush b/w morula gastrula and blastula
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morula--
cleavage of zygote results in a solid ball of cells called morlua , having 8-16 cells.zona pellucida still forms the outer cover.morula descend slowly towards uterus in 4-6 days and corona radiata detaches during this period.
blastula--
as morila enters uterus, it gets a rich supply of nutrients. outer peripheral cells enlarge and flatten further.they form Trophoblast or Trophoectoderm which secrete a fluid into the interior creating a cavity called Blastocoel.the inner cell mass now comes to lie on one side as embyonal knob. with the formation of blastocoel morula is converted into blastula.
gastrula--
the product of gastrulation is called gastrula. gastrulation is a dynamic event in which cells show morphogenetic movement. formation of primitive streak in epiblast marks the beginning of gastrulation. formation of three germ layers take place. obliteration of blastocoel and formation of archaenteron with blastopore(future mouth) mark the ending of gastrulation
cleavage of zygote results in a solid ball of cells called morlua , having 8-16 cells.zona pellucida still forms the outer cover.morula descend slowly towards uterus in 4-6 days and corona radiata detaches during this period.
blastula--
as morila enters uterus, it gets a rich supply of nutrients. outer peripheral cells enlarge and flatten further.they form Trophoblast or Trophoectoderm which secrete a fluid into the interior creating a cavity called Blastocoel.the inner cell mass now comes to lie on one side as embyonal knob. with the formation of blastocoel morula is converted into blastula.
gastrula--
the product of gastrulation is called gastrula. gastrulation is a dynamic event in which cells show morphogenetic movement. formation of primitive streak in epiblast marks the beginning of gastrulation. formation of three germ layers take place. obliteration of blastocoel and formation of archaenteron with blastopore(future mouth) mark the ending of gastrulation
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