File:The primitive streak and notochordal canal in Chelonia (Plate VIII) BHL4780758.jpg

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PLATE VIII.
All figures magnified 73 diameters, except Figures 35, 42, and 44. which are magnified 420 diameters.
Fig. 35. Transverse section in the region of the notochordal canal, taken at the position of line 35, Fig. 44. Surface views of this embryo are seen in Figs. 3, 3', Plate I.
Figs. 36-43. Transverse sections of the streak taken at the points indicated in Fig. 44 by corresponding numbers.
Fig. 39. A layer of yolk. cl. vt, is spread out over the ectoderm.
Fig. 40. The ectoderm is separated at the points ec'en. The yolk, cl. vt., is streaming through this gap.
Fig. 41. The ectoderm is widely separated at the points ec'en. The yolk is spread out over the ectoderm.
Fig. 42. Cells and yolk globules outlined under higher magnification by means of the camera lucida; ec'en, are points at which the ectoderm is proliferating nuclei ventrally and laterally.
Fig. 43. The ectoderm is differentiated entirely across the dorsal surface, but it is mixed with, and seems to be feeding on, the yolk cells within and above it.

Fig. 44. A reconstruction in the sagittal plane from cross sections. The sagittal plane falls at the points marked 44 on the transverse sections, Figs. 36-43. The lumen of the notochordal canal is filled for the posterior third of its extent with a substance which I interpret as degenerating cells.
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Source https://www.biodiversitylibrary.org/pageimage/4780758 The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark.
Author Davenport, Gertrude Anna Crotty
Page ID
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4780758
Item ID
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26729 (Find related Wikimedia Commons images)
Title ID
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5777 (Find related Wikimedia Commons images)
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Plate VIII
BHL Page URL
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https://www.biodiversitylibrary.org/page/4780758
DOI
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10.5962/bhl.title.5777
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Illustration Foldout
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current10:17, 9 April 2024Thumbnail for version as of 10:17, 9 April 20242,555 × 1,863 (583 KB)Rasbak (talk | contribs)
15:03, 19 November 2015Thumbnail for version as of 15:03, 19 November 20152,555 × 1,863 (263 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | source = http://www.biodiversitylibrary.org/pageimage/4780758 | description = The primitive streak and notochordal canal in Chelonia / by Gertrude Crotty Davenport. Prepared under the direction of Edward Laurens Mark. |...

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