The original ball of cells develops a lateral pouch, the archenteron.
2.
The endoderm of the archenteron will fuse with the ectoderm of the blastocoel wall.
3.
A small number of imaginal discs form, encircling the archenteron ( developing gut ) and coalesce to form the juvenile.
4.
Another invagination of the surface will fuse with the tip of the archenteron as the mouth while the interior section will become the gut.
5.
The filopodia thin fibers formed by the mesenchyme cells found in a late gastrula contract to drag the tip of the archenteron across the blastocoel.
6.
The stage starts with the gastrula; as the archenteron forms, pockets of migrating cells also form, creating another layer between the endoderm and ectoderm, the mesoderm.
7.
Following ingression, a blastopore develops where the cells have ingressed, in one side of the embryo and it deepens to become the archenteron, the first formative stage of the gut.
8.
In animals at least as complex as earthworms, the embryo forms a dent on one side, the blastopore, which deepens to become the archenteron, the first phase in the growth of the gut.
9.
The archenteron initially forms, and the mesoderm splits into two layers : the first attaches to the body wall or ectoderm, forming the parietal layer and the second surrounds the endoderm or alimentary canal forming the visceral layer.
10.
In animals at least as complex as an earthworm, the embryo forms a dent on one side, the blastopore, which deepens to become the archenteron, the first phase in the formation of the proto " meaning " first " ) while the anus formed later as an opening made by the other end of the gut.
Meaning
central cavity of the gastrula; becomes the intestinal or digestive cavity
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