Histiotrophe

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Histiotrophe (from the Greek. Ίστός [ histos ] " tissue " and τρόφος [ Trophos ] "of Dieting") refers to the supply of the embryos from the uterine lining ( endometrium substances formed). It belongs to the Hämotrophe the so-called Embryotrophe that represents the totality of all the materials provided to supply the embryo. Histiotrophe plays the main role in the nutrition of the embryo or fetus , especially in placenta types with preserved uterine lining ( placenta epitheliochorialis , placenta syndesmochorialis ) .

Histiotrophe is formed by the glands of the uterine lining ("uterine milk") as well as from decay products of the epithelium and substances escaping from the blood . These substances are absorbed by the epithelium of the villi ( chorion ) of the placenta via pinocytosis . In the histiotrophe, so-called giant cells can occur physiologically , which can come from both the maternal and the fetal part ( trophoblast ) of the placenta. These giant cells can occur in the form of binuclear cells ( diplokaryocytes ), syncytia or symplasmas . In ungulates , especially horses , the histiotrophe can thicken and form hippomanes .

literature

  • Monika Kressin, Bertram Schnorr: Embryology of Pets. 5th edition. Enke-Verlag, Stuttgart 2006, ISBN 3-8304-1061-1 .