File:Sea urchin left-right asymmetry.jpg
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Left-right Asymmetry in the Sea Urchin
During cleavage, mesoderm (red cells at 60-cell stage) and small micromeres (purple cells at vegetal pole) become specified. At the end of gastrulation, progeny of these two cell types contribute to the coelomic pouches (red and purple outpockets seen at the tip of the archenteron).
During larval stages, the adult rudiment grows from the left coelomic pouch. After metamorphosis, that rudiment grows to become the adult. Embryonic axes are shown relative to the 60-cell cleavage and gastrula stages. The aboral-oral axis is also known as the dorsal-ventral axis. The animal-vegetal axis is the only axis established prior to fertilization.
Oral-aboral axis specification occurs early in cleavage, and left-right axis determination occurs at the late gastrula stage.
- Links: Sea Urchin Development | Axes Formation
Reference
<pubmed>23055829</pubmed>| PLoS Biol.
Copyright
© Warner et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Figure 1. doi:10.1371/journal.pbio.1001404.g001 journal.pbio.1001404.g001.jpg adjusted in size and labelling.
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| Gwalagizhi | Nyangagi | Dimensions | User | Comment | |
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| current | 14:21, 6 September 2014 | | 1,000 × 288 (40 KB) | Z8600021 (talk | contribs) | ==Left-right asymmetry in the sea urchin== During cleavage, mesoderm (red cells at 60-cell stage) and small micromeres (purple cells at vegetal pole) become specified. At the end of gastrulation, progeny of these two cell types contribute to the coelo... |
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