[Detection and histochemical identification of lipoid enclaves in rat trophoblast between 15th and 20th day of gestation (author's transl)].

Histochemical study of lipids in the allanto placenta of albino rats from the 10th to the 20th day of gestation permits the identification of lipoids enclaves in the trophoblastic cells. Their nature and topography show variations during the placenta evolution. Following a lipoid load, essentially acidic and evenly distributed both in the syncytium and in the giant cells (10th to 15th day), pigmented lipids appear. The latter are exclusively localized in the labyrinth and become preponderant at the 20th day, when the acidic lipid content has decreased extensively. The Autours discuss the nature of these pigmented lipoids and their relationship with the lipid metabolism of the placenta.