The mesoderm then lies immediately beneath the ectoderm, with the endoderm lining the roof of the archenteron, the future gut. |
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It doesn't seem to do much of anything, except to offer little suggestions to cells migrating into the archenteron. |
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During gastrulation the material of the notochord comes to lie middorsally in the roof of the archenteron. |
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The cavity of the archenteron increases as more material from the outside is transferred inward, and the blastocoel becomes almost completely obliterated. |
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Whether derived from an archenteron or formed by folding of the endodermal sheet, the canal initially does not possess an opening at its anterior end. |
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