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GASTRULATION (Embryo shape (Avian - disk (Study model (Contain Henson'…
GASTRULATION
Embryo shape
Avian - disk
Study model
Contain Henson's node
Mammal - sphere
NODE REGRESSES
Leaving mesodermal cells behind
Forming the notochord and somites
Till the stem cells run out
TAIL BUD
Stem cell knot
2 GASTRULATION
Epiblast converge to form blastopore
Primitive streak formed
Tube forms
Intercalation pushes hypoblast away
Gastrula formed
New layers of cells deposited
Deuterestomes
blastopore originates at caudal end
Most animals triploblasts
have 3 germlayers
Endoderm
Digestive tract
Mesoderm
Muscles, organs, bones
Ectoderm
Skin
Remains as epiblast
1 INGRESSION
Epithelial to mesenchyme trans
Mesenchyme to epithelial trans
ENDODERM formed
Become bottle shaped
Digest basal lamina
No more tight junctions
2 INGRESSION
MESODERM formed
Stay mesenchymal
NODE formation
cells at end of streak condense
Stem cells
Epiblasts ingress through the node
Forms head tissues
Stage pregnancies fail