Vertebrate Embryology; A Text-Book for Students and Practitioners

Vertebrate Embryology; A Text-Book for Students and Practitioners

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1893 edition. Excerpt: ...along its outer side at several places with the vascular reticulum of the area pellucida and area vasculosa. By coalescence of the vessels of the reticulum at one place, with shrinking and disappearance of the reticulum in front of and behind this spot, the definite vitelline artery of each side is formed (Figs. 113 and 128, Av): this is a large vessel running outwards from the aorta, between the splanchnopleuric mesoblast and the hypoblast, and passing out beyond the embryo to open distally into the vascular reticulum of the area vasculosa. Before the end of the second day the two aortas have met and fused for a short distance along the middle part of their course, separating again towards their hinder ends, and giving off at intervals along their length small arteries to supply the various parts of the body. By the fourth day the union of the two aorta? has extended much further back than before, and involves the part from which the vitelline arteries arise. The two vitelline arteries have themselves coalesced at their proximal ends, and now spring from the aorta as a single trunk, which divides almost at once into the right and left vitelline arteries, of which the left one is much the larger. The allantoic, or, as they are often called, umbilical arteries ("Fig. 128, AA), arise from the aorta) just beyond their point of bifurcation, and run outwards to the allantois. The left allantoic artery is usually the larger of the two from the first, and becomes ultimately the sole one, the right allantoic artery disappearing. I. The Veins. The chief peculiarities in the veins of the chick, as distinguished from those of the tadpole, consist in the large size and great importance of the vitelline and allantoic veins, which return to the embryo the...
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Product details

  • Paperback | 212 pages
  • 189 x 246 x 11mm | 386g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236615409
  • 9781236615404