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FIG. 7. SURFACE VIEW OF THE GERMINAL Disc OF A HEN'S EGG DURING THE LATER STAGES OF SEGMENTATION.
(Chromic Acid Preparation.)
At c in the centre of the disc the segmentation masses are very small and numerous. At b, nearer the edge, they are larger and fewer ; while those at the extreme margin a are largest and fewest of all. It will be noticed that the radiating furrows marking off the segments a do not reach to the extreme margin e of the disc.
The drawing is completed in one quadrant only ; it will of course be understood that the whole circle ought to be filled up in a precisely similar manner.
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Reference
Foster, M., Balfour, F. M., Sedgwick, A., & Heape, W. (1883). The Elements of Embryology. (2nd ed.). London: Macmillan and Co.
The Elements of Embryology (1883)
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current | 15:37, 8 January 2011 | 726 × 612 (68 KB) | S8600021 (talk | contribs) | FIG. 7. SURFACE VIEW OF THE GERMINAL Disc OF A HEN'S EGG DURING THE LATER STAGES OF SEGMENTATION. (Chromic Acid Preparation.) {{Template:Foster 1883}} {{Template:1_Foster_1883}} |
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