Gastrulation
Gastrulation - The point in embryogenesis where the
basic organization of the organism is established.
A. Establishment of the three basic germ
layers
Ectoderm, Mesoderm, Endoderm
B. Groups of cells that will give rise to
specific organ systems and tissues
are moved into the right position both
externally and internally.
C. Groups of cells that will influence each
others differentiation are positioned so
they can have an effect on each other.
How are layers of tissue established?
How do cells get to their proper positions for development?
In part, this is accomplished by
various types of Morphogenetic
Movements.
QUESTIONS?
Morphogenetic Movements
Epiboly
Morphogenetic Movements
Invagination, Evagination
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