File:The Journal of experimental zoology (1905) (14777736424).jpg

Identifier: journalofexperim02harr (find matches)
Title: The Journal of experimental zoology
Year: 1905 (1900s)
Authors: Harrison, Ross G. (Ross Granville), 1870-1959 Brooks, William Keith, 1848-1908 Wistar Institute of Anatomy and Biology American Society of Zoologists
Subjects: Zoology
Publisher: (New York, etc.) Wiley-Liss (etc.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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left side. Fig. 3. Twenty-cell stage from the animal (ventral) pole. Fig. 4. Twenty cells, transitional to the 24-cell stage, from the vegetal (dorsal) pole. The graycrescent is now segregated in the two pairs of cells A^--, A^-^; the yellow crescent will be localized inseparate cells at the close of the division which has already begun in the cells B^-^. Figs. 5 and 6. Ventral and dorsal views of the same egg in the 64-cell stage. The yellow andthe gray crescents each consist of a double arc of cells; the anterior arc of the gray crescent (A^-*, A-^)is composed of neural plate cells, the posterior arc (A-^, A^-), of chorda cells; only two pairs of cellsin the yellow crescent (B-*, B^-*) are muscle cells, the others are mesenchyme. The pair of. cells A^-*also gives rise to mesenchyme. All the other cells of the dorsal hemisphere (Fig. 6) are endodermal.All the cells shown in Fig 5, except those of the yellow and gray crescents, are ectodermal. Mosaic Development in Ascidia77 Eggs- 149
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