File:Keibel1900 plate01.jpg

Plate 1

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

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Figure 1

(S.N. 452) 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.

Figure 2

(S.N. 436) Also the seed shown in Figure 2 was taken from a 9 hours embryonated egg fixed with sublimate-acetic acid. The diameter of the whole seed is 4.2 mm. The shape of the area pellucida is pear-shaped, its length is 2.1 mm, its greatest width 1.5 mm. The primitive streak is 1.6 mm long. Before the front end of primitive streak are cells that create the endoderm is tight and the cover the investments of the head extension well. On the primitive streak a distance is far to detect a shallow trough. At the rear end of the primitive streak area is very wide. The mesoderm not go beyond the area of the area pellucida. No 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 3) Embryology Keibel1900 plate01.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Keibel1900_plate01.jpg

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