The practice of obstetrics, designed for the use of students and practitioners of medicine . Fig. 95.—Human Ovum Twelfth to Thirteenth Day.—{Reichert.) Another modification of the membrane-formation which has been used toexplain the condition in man is well illustrated in the mouse and some otherrodents. The heap of cells at the pole first differentiates off a few entodermalcells which multiply and form a layer. A cavity then appears in the ectodermicportion of the mass of cells which enlarges so greatly as to form a sac nearlycovered by the ectodermic layer, the whole extending far into the i
The practice of obstetrics, designed for the use of students and practitioners of medicine . Fig. 95.—Human Ovum Twelfth to Thirteenth Day.—{Reichert.) Another modification of the membrane-formation which has been used toexplain the condition in man is well illustrated in the mouse and some otherrodents. The heap of cells at the pole first differentiates off a few entodermalcells which multiply and form a layer. A cavity then appears in the ectodermicportion of the mass of cells which enlarges so greatly as to form a sac nearlycovered by the ectodermic layer, the whole extending far into the interior of THE MEMBRANES AT TERM. 65 the outer or Raubers layer of the ovum. The embryo is formed at the deepestportion of this invagination. The amnion is produced by the growing togetherin an hour-glass-Uke formation of the invagination over the back of theembryo; the remaining portion next the original implantation of the heap ofcells becoming the chorion and finally a part of the placenta. Here, too, theremaining portion of the ectoderm in Raubers layer does not apparently become
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
