Contribution to knowledge on magma reticulare
Schmidt, W.; Schwarzfurtner, H.
Anatomischer Anzeiger 149(1): 1-10
1981
ISSN/ISBN: 0003-2786 PMID: 7235267 Document Number: 180271
The structure of the magma is being described consequently to light-microscopic tests. It consists of argyrophylic fibrils and a granular component. The granules consists of glycoproteins, proteoglycans and proteins. It has been attempted to trace the origin of muco-substances and their continuous development by means of light microscopic preparations. The formation of these substances occurs in the syncytiotrophoblast. They are discharged into the villus stroma and directed through the extraembryonic mesenchymee to the yolk sac. There they are absorbed by the outer layer of cells of the yolk sac and are passed on to the capillaries of the vasa vitellina. Thus the hypothesis is being affirmed that the yolk sac plays an important role for the feeding of the embryo and to be sure finds itself in full function during the time before the placenta-circulation. Possibly the blood-liquid of the early embryonal metabolism is being created from the liquid that finds itself within the extraembryonic coelom. In cases of a lesion of the embryo and a resulting faulty resorption of the alimentating substances does result an accumulation and an increasing augmentation within the extra-embryonic coelom. This is leading to the well known picture of an increase of the magma reticulare. Considerations concerning the definition of the term "magma reticulare" and its limitation towards the term of "extra-embryonic mesenchyme" are joined here. It is proposed to speak in normal cases of an extra-embryonic mesenchyme (Mesoderm) and to reserve the term of magma reticulare for conditions of pathological alterations.