Dottersack

That Dottersack the nourishing organ of the embryo is with the non--mammals under the vertebrate animals. In the later Embryonalentwicklung replaces those Plazenta the mammals its function, it is however in the early phase a necessary element. Reaching with humans a size to 5mm, he takes over their metabolic function before training of the liver partially. Out of the wall of the Dottersackes those go Germ cells and those Main cells for the blood formation out. With the cutting off of the intestine pipe of the Dottersack and the lateral Abfaltung of the Embryonalanlage the small Dottersack lies in that Chorionhoehle. The intestine pipe separates itself from the roof of the Dottersackes.

That Dottergang (Ductus omphaloentericus, Ductus vitellinus) connects now the Dottersack with the central intestine. The course is first a far opening, becomes however narrow and long with the growth of the embryo. Normally the Dottergang regresses in the sixth week. With a frequency from 2-4% a small part remains existing and forms a Aussackung of the Ileums, that Meckel Divertikel. The course can remain open also over its entire length and form a connection by intestine and belly navel (navel or Dottergangfistel). Faezes can withdraw then. The intestine can itself rarely by those Fistel outward urge. Bindegewebige strands form and in the center section develop a large at both ends of the Dotterganges Zyste, one speaks of the Enterokystom or Dottergangszyste. Since the strands pull by the body cave, can they to strangulation or twists of the intestine lead.