The metameric pattern of the head mesoderm — does it exist?
The metameric pattern of the head mesoderm — does it exist?
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头部中胚层的同色异谱模式——它存在吗？
DOI：
10.1007/bf00186835
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
F. Wachtler
中科院分区：
文献类型：
--
作者：
R. Freund;D. Dörfler;W. Popp;F. Wachtler
脊椎动物胚胎的近轴头部中胚层是否像躯干一样分节组织成体节是一个长期存在的问题。一方面，在脊椎动物胚胎的前头部中胚层中没有体节，另一方面，这种节段模式已被描述为体节的名称。为了研究鸟类胚胎头部中胚层细胞的模式，我们进行了扫描电子显微镜，计算机辅助重建的头部中胚层和头部中胚层细胞的密度分析。我们观察到区域差异内的头部中胚层的鸟类胚胎，但我们不能看到一个一致的体节模式的头部中胚层。综上所述，我们认为鸟类头部中胚层不是以位变异构模式排列的。
It is a long-standing question whether the paraxial head mesoderm of vertebrate embryos is segmentally organized into somites like the trunk or not. On the one hand, no somites are seen in the anterior head mesoderm in vertebrate embryos, on the other hand, such a segmental pattern has been described under the name of somitomeres. In order to investigate the patterning of mesodermal cells in the head of avian embryos we performed scanning electron microscopy, computer assisted reconstructions of the head mesoderm and density analyses of head mesoderm cells. We observed regional differences within the head mesoderm of avian embryos, but we could not see a consistent somitomeric pattern in the head mesoderm. In sum, we consider that the avian head mesoderm is not arranged in a metameric pattern.