Archenteron:
During gastrulation of the developing embryo, the archenteron is formed and is known as the primitive gut. In amphibians and fish, the indentation created is called the dorsal blastopore. In birds and mammals it is known as the primitive streak.
The invagination occurs towards the blastocoel hence the archenteron displaces the blastocoel.
Removal of the the deep Involuting marginal zone (IMZ) cells would stops the formation of the archenteron.
References:
"Archenteron." Wikipedia, the Free Encyclopedia. 2010. Web. Nov. 2010.
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