Question

Explain the process of morphogenetic movement during gastrulation.

Answer 1

Morphogenetic movement

(A) Morphogenetic movement in the early embryo takes place mainly through the movement and deformation of the epithelial cells, which constitute the embryo, and includes: a) invagination movement of epithelium, b) extension movement caused by rearrangement of epithelial cells, and c) locomotive movement (migration) of epithelial tissues. (B) Examples of morphogenetic movement in amphibians and mammalian embryos. The cells move in the directions of the red arrows shown in the diagram. a) Gastrulation of the frog embryo: the mesoderm and endoderm move into the interior of the embryo through invagination and extension movements and form an inner lining of the ectoderm.