XENOPUS GASTRULATION

XENOPUS GASTRULATION

7.      Xenopus GASTRULATION

Due to the contraction of bottle cells, dorsal lip of the blastopore forms. From the early "frown" blastopore continues to develop until blastopore can be observed as an intact circular ring of involuting cells. Due to convergent extension blastopore get close at the yolk plug and thus elongation of embryo along the anterior-posterior axis occur.

At the exterior edge of the blastula, a small group of cells change their shape and get narrow, this is called apical constriction, generates a local invagination, which begins to roll a sheet of cells towards the interior and drives more interior cells upwards. Due to their shape, the constricted cells are called bottle cells.


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