. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. blast at the animal pole continues to remain distinct from the under- lying layers (Fig. 2). Upon reaching the placental zone, the vesicle, which has now attained a diameter of about 430 mm, becomes attached to the uterine mucosa^of this area. At first the attachment could be more properly spoken of as simply an adhesion. There is here a slight break in my series, and I am therefore not able to speak with con- fidence concerning the changes that immediately follow the attachment of the vesicle; but from what takes place later
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. blast at the animal pole continues to remain distinct from the under- lying layers (Fig. 2). Upon reaching the placental zone, the vesicle, which has now attained a diameter of about 430 mm, becomes attached to the uterine mucosa^of this area. At first the attachment could be more properly spoken of as simply an adhesion. There is here a slight break in my series, and I am therefore not able to speak with con- fidence concerning the changes that immediately follow the attachment of the vesicle; but from what takes place later, it seems clear that, in the strict sense of the word, an „implantation" of the egg does not take place. The attachment of the egg is apparently followed immedia- tely by the forma- tion of the Träger, or primitive pla- centa, which arises from that portion of the trophoblast which comes di- rectly in contact with the mucosa. The Träger is soon differentiated into two rather distinct regions One of these occupies the central part of the attachment area and is characte- rized by retaining for some time the primitive condition of the trophoplast; the other is a zone imme- diately surrounding the former and representing the outer border of the attachment area. This zone is conspicuous for the thickened 24* *#*. ' /?'^^tV:-'^^*^,'li' ?>4t^,.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Anatomische Gesellschaft. Jena : G. Fischer
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherjenag, bookyear1912
