File:Lumbricus Segmentation and early stages of development.jpg
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| Description | Fig. 8. Segmentation and early stages of development of Lumbricus, after E. B. Wilson. A, B, C, D, successive stages of segmentation. E. Blastula stage. F. Commencement of invagination ; the macromeres form a flat plate on the ventral side. G. An embryo somewhat younger than F viewed from above, showing the mesomeres and mesoblast rows derived from them. H, Gastrula stage viewed from below, showing the wide oval blastopore bounded by macromeres; at the sides the micromeres are growing over the macromeres. J. Later stage, showing the elongated blastopore and the further overgrowth of the macromeres by the micromeres. A. Optical longitudinal section through a later stage after closure of the blastopore. bp, blastopore; ec, ectoderm ; en, endoderm ; ent, enteron (archenteron) ; mac, macromeres ; mes, mesoblast ; mic, micromeres ; mm, mesomeres |
| Date | |
| Source | https://www.flickr.com/photos/internetarchivebookimages/20763093425 An introduction to the study of the comparative anatomy of animals. London, G. Bell & sons. |
| Author | Bourne, Gilbert Charles |
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This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. |
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This image was originally posted to Flickr by Internet Archive Book Images at https://flickr.com/photos/126377022@N07/20763093425. It was reviewed on 23 March 2024 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:28, 23 March 2024 | | 1,124 × 1,088 (457 KB) | Rasbak (talk | contribs) | {{information |description=Fig. 8. Segmentation and early stages of development of Lumbricus, after E. B. Wilson. A, B, C, D, successive stages of segmentation. E. Blastula stage. F. Commencement of invagination ; the macromeres form a flat plate on the ventral side. G. An embryo somewhat younger than F viewed from above, showing the mesomeres and mesoblast rows derived from them. H, Gastrula stage viewed from below, showing the wide oval blastopore bounded by macromeres; at the sides the mic... |
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