The rolling of endodermal and mesodermal cells from the surface of embryo into its interior is called as
A
Ingression
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B
Invagination
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C
Involution
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D
Inversion
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Solution
The correct option is C Involution There are certain major types of cell movements, that occur during gastrulation as: Ingression: Individual cells leave an epithelial sheet and become freely migrating mesenchyme cells. Invagination: A sheet of cells (epithelial sheet) bends inward. Involution: An epithelial sheet (mesoderm or endoderm) rolls inwards to form an underlying layer Inversion: Here, the hollow sphere turns inside-out through an opening. Thus, the correct answer is option (C).