Outlines of Zoology
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In our eReader you can find the full English version of the book. Read Outlines of Zoology 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 Outlines of Zoology
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(a) The Amnion. At an early stage in development the head end of the embryo seems to sink into the subjacent yolk. A semilunar fold of the blastoderm, including epiblast and mesoblast, rises up in front. Similar folds appear laterally. All the folds increase in size, arch up- wards, and unite above, forming a dome over the embryo. Each of these folds is double ; the inner limbs unite to form " the true amnion " ; the outer limbs unite to form "the false amnion, " "serous membrane, " or subzonal... membrane. The cavity bounded by the true amnion contains an amniotic fluid bathing the outer surface of the embryo ; the cavity between the true and the false amnion is lined by mesoblast, and is continuous with the pleuro-peritoneal or body cavity of the embryo. The amniotic folds extend not only over the embryo, but ventrally around the yolk-sac, which they completely invest.
(b) The Allantois. While the amnion is being formed, a sac grows out from the hind end of the embryonic gut. This is the allantois lined internally by hypoblast, externally by mesoblast.
What to read after Outlines of Zoology?
You can find similar books in the "Read Also" column, or choose other free books by J Arthur John Arthur Thomson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
(a) The Amnion. At an early stage in development the head end of the embryo seems to sink into the subjacent yolk. A semilunar fold of the blastoderm, including epiblast and mesoblast, rises up in front. Similar folds appear laterally. All the folds increase in size, arch up- wards, and unite above, forming a dome over the embryo. Each of these folds is double ; the inner limbs unite to form " the true amnion " ; the outer limbs unite to form "the false amnion, " "serous membrane, " or subzonal... membrane. The cavity bounded by the true amnion contains an amniotic fluid bathing the outer surface of the embryo ; the cavity between the true and the false amnion is lined by mesoblast, and is continuous with the pleuro-peritoneal or body cavity of the embryo. The amniotic folds extend not only over the embryo, but ventrally around the yolk-sac, which they completely invest.
(b) The Allantois. While the amnion is being formed, a sac grows out from the hind end of the embryonic gut. This is the allantois lined internally by hypoblast, externally by mesoblast.
What to read after Outlines of Zoology?
You can find similar books in the "Read Also" column, or choose other free books by J Arthur John Arthur Thomson to read onlineMoreLess
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