File:Foster007.jpg

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.

Embryology - 27 Apr 2024        Expand to Translate
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Foster M. Balfour FM. Sedgwick A. and Heape W. The Elements of Embryology (1883) Vol. 1. (2nd ed.). London: Macmillan and Co.

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The Elements of Embryology - Volume 1 (1883)

The History of the Chick: Egg structure and incubation beginning | Summary whole incubation | First day | Second day - first half | Second day - second half | Third day | Fourth day | Fifth day | Sixth day to incubation end | Appendix

Historic Disclaimer - information about historic embryology pages

Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

chicken

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Cite this page: Hill, M.A. (2024, April 27) Embryology Foster007.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Foster007.jpg

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© Dr Mark Hill 2024, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G