A treatise on the science and practice of midwifery . sels. with the maternal blood, in consequences of the anatomical arrange-ments presently to be described; but the two do not directly mix, asthe older physiologists believed, for none of the maternal bloodescapes when the umbilical cord is cut, nor can the minutest injectionsthrough the foetal vessels be made to pass into the maternal vascularsystem, or vice versa. In addition to the looped terminations of theumbilical vessels, Farre and Schroeder van der Kolk have describedanother set of capillary vessels in connection with each villus (Fi
A treatise on the science and practice of midwifery . sels. with the maternal blood, in consequences of the anatomical arrange-ments presently to be described; but the two do not directly mix, asthe older physiologists believed, for none of the maternal bloodescapes when the umbilical cord is cut, nor can the minutest injectionsthrough the foetal vessels be made to pass into the maternal vascularsystem, or vice versa. In addition to the looped terminations of theumbilical vessels, Farre and Schroeder van der Kolk have describedanother set of capillary vessels in connection with each villus (); This consists of a very fine network covering each villus, andvery different in appearance from the convoluted vessels lying in itsinterior, which are the only ones which have been usually Farre believes that these vessels only exist in the early months of CONCEPTION AND GENERATION. 103 pregnancy, and that they disappear as pregnancy advances. Priestlev1suggests that they may not be vessels at all, but lymphatics, which Fig. a. Terminal villus of fcetal tuft, minutely injected. 6. Its nucleated nonvascular sheath. (AfterF arre.) may possibly absorb nutrient material from the mothers blood, andthrow it into the foetal vascular system. The existence of lymphatics, Fig. 57.
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Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
