Progressive expansion of the amnion from the umbilical ring ( surrounding the roots of the vitelline duct and connecting stalk ) creates a tube of amniotic membrane.
2.
When the myotomic downgrowths reach the ventral aspect their anterior portions, i . e . the sheaths of the recti muscles, become continuous with the tissue of the umbilical ring.
3.
It forms an umbilical ring of mesodermal condensation surrounding the coelomic portal, and is present in the 16 * 1 mm . embryo, but more emphatically so in the 23 mm . embryo.
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