Transactions of the American Microscopical Society Volume 37, No. 4 pdf
Transactions of the American Microscopical Society Volume 37, No. 4 pdf
Transactions of the American Microscopical Society Volume 37, No. 4 by U S Government
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Author: U S Government
Page Count: 24 pages
Published Date: 22 Jan 2013
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781234372040
File Name: Transactions.of.the.American.Microscopical.Society.Volume.37,.No..4.pdf
Download Link: Transactions of the American Microscopical Society Volume 37, No. 4
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...as outgrowths from the Wolffian duct. In order to prove unequivocally that the Wolffian tubules arise from the mesoblastic tissue of the middle plate one must have embryos of such ages which will show the complete cycle of changes from undifferentiated mesoblastic tissue to fully formed Wolffian vesicles. From this point of view I am unfortunate in the selection of my subject material as in my youngest embryos (2.5 mm.) the segmental vesicles are already well formed and differentiated from the surrounding tissue (see w. v. figures 1 and 2). If the vesicles arose from the coelom epithelium one would expect to find some indication of this occurrence at the point to where they were constricted off from the latter, opposite to the vesicles, but by observing the vesicles (w. v.) in figures 1 and 2, it will be seen that no fissures, thinning out of the epithelium, or depression of the latter are to be found. The anlage of the Wolffian canals develop in a distally extending direction and in the embryo from which figures 1 and 2 are taken the vesicles are well formed at the proximal end. At the distal end of this embryo the cells of the mesoblastic tissue are just arranging themselves around a common center and no lumen is present. Another point which adds considerable confirmatory evidence is the fact that the immature vesicles at the distal end are no nearer the coelom epithelium than the more fully developed vesicles of the proximal end; which should be the case if the vesicles arose from the coelom epithelium. In the embryo (3 mm. long) from which figures 7 and 21 are taken one finds separating the coelom epithelium from the underlying blastem, first a compact layer of connective tissue (c. t.) and second an intercellular space (i. s.) each...
Read online Transactions of the American Microscopical Society Volume 37, No. 4 Buy Transactions of the American Microscopical Society Volume 37, No. 4 Download and read Transactions of the American Microscopical Society Volume 37, No. 4 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Transactions of the American Microscopical Society Volume 37, No. 4
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Transactions of the American Microscopical Society Volume 37, No. 4 by U S Government
Author: U S Government
Page Count: 24 pages
Published Date: 22 Jan 2013
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781234372040
File Name: Transactions.of.the.American.Microscopical.Society.Volume.37,.No..4.pdf
Download Link: Transactions of the American Microscopical Society Volume 37, No. 4
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ...as outgrowths from the Wolffian duct. In order to prove unequivocally that the Wolffian tubules arise from the mesoblastic tissue of the middle plate one must have embryos of such ages which will show the complete cycle of changes from undifferentiated mesoblastic tissue to fully formed Wolffian vesicles. From this point of view I am unfortunate in the selection of my subject material as in my youngest embryos (2.5 mm.) the segmental vesicles are already well formed and differentiated from the surrounding tissue (see w. v. figures 1 and 2). If the vesicles arose from the coelom epithelium one would expect to find some indication of this occurrence at the point to where they were constricted off from the latter, opposite to the vesicles, but by observing the vesicles (w. v.) in figures 1 and 2, it will be seen that no fissures, thinning out of the epithelium, or depression of the latter are to be found. The anlage of the Wolffian canals develop in a distally extending direction and in the embryo from which figures 1 and 2 are taken the vesicles are well formed at the proximal end. At the distal end of this embryo the cells of the mesoblastic tissue are just arranging themselves around a common center and no lumen is present. Another point which adds considerable confirmatory evidence is the fact that the immature vesicles at the distal end are no nearer the coelom epithelium than the more fully developed vesicles of the proximal end; which should be the case if the vesicles arose from the coelom epithelium. In the embryo (3 mm. long) from which figures 7 and 21 are taken one finds separating the coelom epithelium from the underlying blastem, first a compact layer of connective tissue (c. t.) and second an intercellular space (i. s.) each...
Read online Transactions of the American Microscopical Society Volume 37, No. 4 Buy Transactions of the American Microscopical Society Volume 37, No. 4 Download and read Transactions of the American Microscopical Society Volume 37, No. 4 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Transactions of the American Microscopical Society Volume 37, No. 4
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