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The fine structure of the yolk\u2010sac placental membrane (i.e., the tissues separating vitelline capillary lumina from the uterine cavity) remained unimpaired during the delay period. Progressive changes included a decrease in the height of the endodermal epithelium, but a thickening of the basement membrane underlying it by repeated replication of the subepithelial basal lamina and an increase in collagen fiber content in the reticular lamina. Transcytosis across the endothelium of the capillaries of the peripheral vitelline circulation remained unchanged throughout the delay period; endocytosis of materials, presumably maternal serum proteins, from the uterine cavity into the apices of the endodermal epithelium, however, decreased with time. At the oldest stage (26 days post\u2010coitum) most endocytosed materials had been stored for hydrolysis in large subapical vacuoles which were identified as secondary lysosomes; and evidence of uptake from the uterine lumen was essentially absent. Accordingly, placental transport of protein by the visceral yolk sac of the rat can be regarded as a perinatal process. The action of an elaborately developed and well\u2010preserved Golgi apparatus in both cellular mechanisms, viz., digestion of maternal proteins and protein transfer, was inferred.<\/jats:p>","DOI":"10.1002\/aja.1001710102","type":"journal-article","created":{"date-parts":[[2005,2,27]],"date-time":"2005-02-27T02:47:40Z","timestamp":1109472460000},"page":"1-14","source":"Crossref","is-referenced-by-count":13,"title":["Changes in the fine structure of rat visceral yolk\u2010sac placenta during prolonged pregnancy"],"prefix":"10.1002","volume":"171","author":[{"given":"William P.","family":"Jollie","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2005,2,3]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/aja.1001040305"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0165-0378(83)90236-X"},{"key":"e_1_2_1_4_1","first-page":"1","article-title":"Studies in prolonged pregnancy in rats","volume":"36","author":"B\u00f8e F.","year":"1938","journal-title":"Acta Pathol. 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