UTERUS AND EMBRYO

ISBN: 9781334421747 Géneros: PS Sinópsis: Excerpt from Uterus and Embryo I Rabbit II ManThe bloodvessels show increased hypertrophy of their epithelium and the perivascular cells form two or three layers around them they are especially remarkable for containing a very large number of multinucleate leucocytes and comparatively few red corpuscles The excessive abundance of white globules continues up to the Oldest stage I have examined sixteenth day The predominance of nucleated corpuscles causes the contents Of the maternal vessels to resemble foetal blood when examined with a low power with high magnifications the dif ference is evident To the foetal blood in the placenta we shall have to recur 7 Uterus at eleven days and three hoursvery great changes have taken place so great that they cannot be under stood completely until some of the intermediate phases are studied Want Of suitable material has hitherto prevented my doing this At the present stage the beginning Of the twelfth day the placenta is distinctly pedunculate and there is consequently a circular cleft between its sides and the closely adjacent peri placenta in the middle of the placenta a deep fissure corresponds of course to the space between the two folds of the uterus out of which the placenta is developed and therefore runs lengthwise of the uterus The allantois has ac quired considerable size and is attached to the surface of the placenta from which the ectoderm has disappeared The glands of the placenta are very far degenerated and altered 1n the subglandular zone the multinucleate cells have appeared and in the outer zone the perivascular cells have increased so as to occupy nearly all the space between the vessels In the peri placental and obplacental regions the modifications are equally noteworthy Such in brief are the more striking changes Let us consider them with greater detailThe diagram on P1 XXIX Will enable the reader to follow the ensuing descriptions The general exp