Contributions to Embryology Volume 9, Nos. 27-46

Contributions to Embryology Volume 9, Nos. 27-46

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...thick specimens while living. X450. B. i., blood islands; e., endothelium; i, interspace; I, lumen of the plexus of vessels. Fig. 20. Plexus of angioblasts from a chick (No. 161) with 13 somites, drawn to show the appearance of the living specimen. The chick had been incubated for 50 hours and then grown for 3 hours and 45 minutes in LockeLewis solution in which there was 1.06 per cent of NaCl. It had 12 somites when the egg was taken from the shell and the drawing was made at that stage. The heart was beating, but there was no circulation. The drawing is to be compared with the blastoderms shown on plate 2, figures 8 and 9, and on plate 3, figure 10; and is from the zone just lateral to the rectangle shown on plate 2, figure 8. The drawing shows the character of the bands of angioblasts before there is any liquefaction whatever as seen seen in the living chick. X475. A, angioblasts; i, interspace. Plate 5. Fig. 21. Section through the marginal sinus of a chick (No. 96) with 18 somites, which had been incubated for 43 hours and then grown for 2 hours in Locke-Lewis solution. It had 17 somites when taken from the shell, and when fixed the eighteenth was just appearing. It is to show a new generation of blood-islands beginning in the marginal sinus, like those of the total preparation shown on plate 3, figure 12. The heart was beating and the circulation well established. The ectoderm is not included in the drawing. X700. B. i., unicellular blood-island in the edge of the marginal sinus; to the left is a larger blood-island, also attached to the endothelium, and the sinus has many free erythroblasts; c, exoccelom; en., endoderm; en. c, endodermal cell full of yolk and ready to become a wandering cell; mes., mesoderm along the border of the...
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Product details

  • Paperback | 264 pages
  • 189 x 246 x 14mm | 476g
  • United States
  • English
  • black & white illustrations
  • 1236861620
  • 9781236861627