File:The evolution of man- a popular exposition of the principal points of human ontogeny and phylogene (1896) (14595021619).jpg

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Identifier: evolutionofmanpo02hae (find matches)
Title: The evolution of man: a popular exposition of the principal points of human ontogeny and phylogene
Year: 1896 (1890s)
Authors: Haeckel, Ernst, 1834-1919
Subjects: Evolution Embryology, Human Anatomy, Comparative Human beings
Publisher: New York, Fowle
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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eprimordial skulL In the posterior half, on the contrary,the primitive vertebral plate breaks up into a number ofhomologous cube-shaped pieces, lying one behind the other;these are the several primitive vertebrae. The numberof these is at first very smaU, but soon increases, as thegerm grows in the posterior direction (Figs. 258-260, uw).The first and earliest primitive vertebrae are the foremostneck-vertebrae ; the posterior neck-vertebrae then originate;then the anterior breast-vertebrae, etc. The lowest of thetail-vertebrae arise last. This successive ontogenetic growthof the vertebral column in a direction from front to rearmay be explained phylogenetically by regarding the many-membered vertebrate body as a secondary product, whichhas originated from an originally inarticulate parent-formby progressive metameric development, or articulation.Just as the many-membered Worms (Earth-worm, Leech) and the closely allied Arthropods (Crabs, Insects) originally52 288 THE EVOLUTION OF MAN.
Text Appearing After Image:
Figs. 258-260.—Lyre-shaped germ-sbield of a Chick, in three consecutivestages of development; seen from the dorsal side; enlarged about twenty-times. Fig. 258, with six pairs of primitive vertebrae. The brain is a sim-ple bladder (Kb). The spinal furrow from x remains wide open ; behind, atz, it is much enlarged, mp, Marrow-plates; sp, side-plates ; y, limit be-tween the pharynx cavity (sh) and the head-intestine (vd). Fig. 259, withten pairs of primitive vertebrse. The brain has separated into threebladders : v, fore-brain ; m, mid-brain ; h, hind-brain; c, heart; dv, yelk-veins. The spinal furrow is still wide open (z). mp, Marrow-plates.Fig. 260, with sixteen pairs of primitive vertebrae. The brain has separated PRIMITIVE VERTEBRA. 289 into five bladders: v, fore-brain; z, twixt-brain; m, mid-brain; h, hind,brain j n, after-brain; a, eye-vesicles; g, ear-vesicles; c, heart; dv, yelk-veins ; mp, marrow-plate; uw, primitive vertebra. developed from an inarticulate worm-form by term

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  • bookid:evolutionofmanpo02hae
  • bookyear:1896
  • bookdecade:1890
  • bookcentury:1800
  • bookauthor:Haeckel__Ernst__1834_1919
  • booksubject:Evolution
  • booksubject:Embryology__Human
  • booksubject:Anatomy__Comparative
  • booksubject:Human_beings
  • bookpublisher:New_York__Fowle
  • bookcontributor:Smithsonian_Institution_Libraries
  • booksponsor:Biodiversity_Heritage_Library
  • bookleafnumber:319
  • bookcollection:biodiversity
  • BHL Collection
  • BHL Consortium
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30 July 2014
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