title: [Endothelial cells in the blood vessels of mature human placental villi].
abstract: In the microcirculatory system of mature human placental villi (small arteries, arterioles and venules respectively, pre- and postcapillaries, capillaries, and postcapillary venules) two endothelial cell types do exist. Numerous micropinocytotic vesicles are common to both types. In addition type I cells are distinguished by bundles of filaments which are probably contractile. Type II cells, however, are marked by a highly developed rough endoplasmatic reticulum, Golgi apparatus, and secretory vesicles. In all vascular parts examined type I cells predominate. The number of endothelial cells with secretory granules decreases in the direction of the venous vascular bed.
mesh_terms: D001160:Arterioles / Q000166:cytology; D002196:Capillaries / Q000166:cytology; D002824:Chorionic Villi / Q000098:blood supply*; D004727:Endothelium / Q000166:cytology* / Q000648:ultrastructure; D005260:Female; D006801:Humans; D010920:Placenta / Q000098:blood supply*; D011247:Pregnancy; D014699:Venules / Q000166:cytology
vernacular_title: Uber Endothelzellen in Zottengefässen der reifen menschlichen Plazenta.