A textbook of obstetrics . loops of maternal early in the history of the ovum 4 the arterioles of this sys-tem open directly into the intervillous spaces o\ the placenta, ] For a case resulting fatally after the injection of perchlorid of iron, see Priestley,he. ri/., p. 41. « Op. <it., S. 414. ? I I bedeflf, quoted by Tarnier, op. cit.^ p. 313. A In Leopolds ovum oi 7 to 8 days tins arrangement was already visible. ems u. Kind. l8o7. Uterus n. K ind, I eipsic, 1897 THE PLACENTA. 113 so that the placental villi are bathed directly in maternal far almost
A textbook of obstetrics . loops of maternal early in the history of the ovum 4 the arterioles of this sys-tem open directly into the intervillous spaces o\ the placenta, ] For a case resulting fatally after the injection of perchlorid of iron, see Priestley,he. ri/., p. 41. « Op. <it., S. 414. ? I I bedeflf, quoted by Tarnier, op. cit.^ p. 313. A In Leopolds ovum oi 7 to 8 days tins arrangement was already visible. ems u. Kind. l8o7. Uterus n. K ind, I eipsic, 1897 THE PLACENTA. 113 so that the placental villi are bathed directly in maternal far almost all authorities are agreed, but as to the relationof the terminal villi to the uterine mucous membranes, the actionof the chorional and decidual epithelium, the changes thatconvert the uterine capillaries at first surrounding the villi intothe large blood-sinuses that are later found in the placenta,. Fig. 83.—The fetal surface of the placenta (Minot). many conflicting theories have been advanced. In regard to therelation between the placental villi and the uterine mucous mem-brane, it has been variously stated that the former enter themouths of the uterine glands (Bischoff) ; that they sink intocrypts in the uterine mucous membrane, which are new forma-tions especially adapted for their reception (Turner) ; that the8 4 PREGNANCY. villi do not sink into glands or crypts, but are intimately investedwith a layer of decidual epithelium, or with an endothelial cover-ing derived from the maternal blood-vessels (Ercolani) ; and thatthis cell-covering acts as a glandular structure, secreting fromthe maternal blood a peculiar substance, the so-called uterinemilk, which acts as nutriment for the fetal blood (Ercolani,Hoffman). It is now well established, however, that the placentalvilli imbed themselves in the soft interglandular substance of thedecidua serotina, and that the connective-t
Size: 1582px × 1579px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidtex, booksubjectobstetrics
