The Principles of Pathology
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In our eReader you can find the full English version of the book. Read The Principles of Pathology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Principles of Pathology
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Fig. 272, p. 759, and Fig. 277, p. 767).
THE THTMUS.
It is so usual to consider the thyroid and the thymus in succession, that, although personally we regard the latter organ as belonging to the lymphatic system, we have not ventured to depart from custom, and, therefore, must here note what is known regarding its function.
Embryological Considerations.— From their embryogeny there is undoubtedly ground for discussing these two glands together. Both originate as segmental organs, as downgrowths... of tubular type from the mouth, or, more accurately, from the branchiae, from the epithelium lining the original gill-clefts. Originating thus, the thymus undergoes a modification very similar to that seen in the faucial tonsils, which, according to Gaskell, are of like origin, the epithelial cell-nests (Hassall's corpuscles) being the remains of the original epithelial downgrowths.
The matter of the origin of the vertebrate leukocytes is still in dispute.
That Beard was too restricted in regarding them as derived primarily and essentially from the thymus epithelium, must, we think, be generally 686 THE THYMUS accepted.
What to read after The Principles of Pathology?
You can find similar books in the "Read Also" column, or choose other free books by J George John George Adami to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Fig. 272, p. 759, and Fig. 277, p. 767).
THE THTMUS.
It is so usual to consider the thyroid and the thymus in succession, that, although personally we regard the latter organ as belonging to the lymphatic system, we have not ventured to depart from custom, and, therefore, must here note what is known regarding its function.
Embryological Considerations.— From their embryogeny there is undoubtedly ground for discussing these two glands together. Both originate as segmental organs, as downgrowths... of tubular type from the mouth, or, more accurately, from the branchiae, from the epithelium lining the original gill-clefts. Originating thus, the thymus undergoes a modification very similar to that seen in the faucial tonsils, which, according to Gaskell, are of like origin, the epithelial cell-nests (Hassall's corpuscles) being the remains of the original epithelial downgrowths.
The matter of the origin of the vertebrate leukocytes is still in dispute.
That Beard was too restricted in regarding them as derived primarily and essentially from the thymus epithelium, must, we think, be generally 686 THE THYMUS accepted.
What to read after The Principles of Pathology?
You can find similar books in the "Read Also" column, or choose other free books by J George John George Adami to read onlineMoreLess
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