File:Conklin 1905 fig09-12.jpg

Fig. 9 - 12

Figs. IX-XII. Camera drawings of entire stained eggs of Ciona iiitesthuiUs viewed as transparent objects. Figs. IX and XI are seen from the posterior pole; Figs. X and XII from the left side. Figs. IX and X represent a 16-cell stage passing into a 24-cell stage ; Figs. XI and XII a 32 -cell passing into a 44-cell stage. The head and tail of the arrow mark the position of the equator (third cleavage plane) at the anterior and posterior poles. The cells of the crescent (mesoderm) are B 6 -3, B 6 -> and B 6 = ; all the other cells of the lower hemisphere are yolk laden and the boundary between protoplasm and yolk is indicated by a crenated line; the stippled areas adjoining the median plane in the cells Bs- 2 and B 6 -3 represent caps of deeply staining protoplasm (clear in life). The segmentation cavity is shaded by vertical lines and the cells bordering it are seen in median optical section ; the cells at the upper pole are columnar, those at the lower pole flattened. The polar bodies, although shaded diagramatically, are present exactly where they appear in the drawings.

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Conklin Figures: Fig 1-2 | Fig 3-6 | Fig 7-8 | Fig 9-12 | Fig 13-16 | Fig 17-20 | Fig 21-24 | Fig 25-26 | Fig 27-33 | Fig 34-35 | Plate I | Plate II | Plate III | Plate IV | Plate V | Plate VI | Plate VII | Plate VIII | Plate IX | Plate X | Plate XI | Plate XII

Reference

Conklin EG. The Organization and Cell-Lineage of the Ascidian Egg (1905) J. Acad., Nat. Sci. Phila. 13, 1.

Conklin 1905 TOC: I. The Ovarian Egg | II. Maturation and Fertilization | III. Orientation of Egg and Embryo | IV. Cell-Lineage | V. Later Development | VI. Comparisons with A.mphioxus and Amphibia | VII. The Organization of the Egg | Summary | Literature Cited | Explanation of Figures

Cite this page: Hill, M.A. (2024, April 26) Embryology Conklin 1905 fig09-12.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Conklin_1905_fig09-12.jpg

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