File:Keibel1900 plate01.jpg

Figure legend text shown below is a modified online translation. Original German text.

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Plate 1.

Figure 1

(p. 452 N.) The germ shown as Figure 1 is taken from a 9 hours embryonated egg fixed with sublimate-acetic acid. The whole seed is approximately circular, its diameter is 4.1 mm. The same in the middle is the zona pellucida, which is near the circular shape, but narrows somewhat towards the rear. Its length is 2.3 mm, and its maximum width 2.15 mm. The primitive streak begins about the middle of the zona pellucida with a button-shaped widening and gradually disappears towards the rear end of the zona pellucida, here a considerable width reaching. Its length is 1.2 mm.

The series shows an early stage of mesoderm formation, the mesoderm does not exceed even the scope of the area pellucida. The primitive streak is already embodied in the typical district front than in the rear. A clear head extension does not exist, nor any traces of blood formation.

Vol. 2 Chicken: Plate 1 | Plate 2 | Plate 3 | Normal Plates Series | Chicken Development

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Reference

Franz Keibel, Normentafeln zur Entwicklungsgeschichte der Wirbelthiere (Normal plates of the development of vertebrates) Volume Hft.2 (1900) Jena, G. Fischer, Germany.

Cite this page: Hill, M.A. (2024, June 14) Embryology Keibel1900 plate01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel1900_plate01.jpg

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