File:Carpenter's principles of human physiology (1881) (14779357844).jpg

Identifier: carpentersprinci00carp (find matches)
Title: Carpenter's principles of human physiology
Year: 1881 (1880s)
Authors: Carpenter, William Benjamin, 1813-1885 Meneses, Henry Power
Subjects: Human physiology Physiology
Publisher: London : J. & A. Churchill
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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e Mastodermthe upper eels have commenced to form a distinct layer. No segmentation cavity is prese™a large peripheral cell; 6 larger cells of the lower parts of the blastoderm j c, middlltoeof blasto-derm ; e, edge of the blastoderm adjoining the white yolk; w, white yolk. becomes separated from the white yolk, on which it has hitherto been lying, by aspace containing fluid, termed the segmentation cavity (see Fig. 332), and withthis a distinction becomes apparent between the upper and lower layers of* For theories in. regard to the formation of the blastoderm by secondary segmenlatio.isee hay Lankester On the Ova of Cephalopoda, Ann. and Mag. of Nat Hist 1873p. 31; Balfour, Development and Growth of the Layers of the Blastoderm, QuarterlyJournal Microscop. bci., 1873, 1874 and 1880 ; Goette, Archiv f. Mikroskop. Anat x1874, and Van Leneden, La formation des feuillets chez le Lapin Archiv do Biologic(1880), torn. i. pp. 128-220. woiogic 3 N 914 OF GENERATION ! EMBRYONIC DEVELOPMENT.
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the segmentation masses. Those of the upper or superficial series assuminga columnar form, and presenting well-defined nuclei, arrange themselves side byside, and constitute a kind of membrane, the Ectoderm or Epiblast (Fig. 331 a) ; whilst those on the- - lower series, which form the Endoderm,in turn give rise tothe Mesoblast andHypoblast, remainlarger (6), have nonucleus, or only anindistinct one, andform rather a closeirregular network^^ -me than a distinct Section of a Blastoderm at right angles to the long axis of the Embryo after membrane. A feweight hours incubation. Taken about midway between the front and hind end. 0f the Ceils 01 thisA, Epiblast; B.Mesoblast; c, Hypoblast; pr, primitive groove;/, fold in the ^nncrif-ntino-blastoderm, probably produced by the action of the chromic acid; me, meso- layer, constitutingblast cell—the line points to one of the peripheral mesoblast cells lying between ft.Q so-Called for-epiblast and hypoblast; bd, formative cells. The following a

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