Origin and Distribution of Specific Spindle Cells in Early Mic Embryos
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概要
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(1) The specific spindle ce l ls treated with mitomycin C were not stained with hematoxylin and eosin, and were transparent, and their nucleoli were hardly recognizable. They were distinguishable clearly among the other cells. They were negative to the Feulgen reaction, and they were not stained with naphthol yellow S stain and fast green FCF stain. With azur B stain, their nucleoli were hardly stainable. (2) The specific spindle cells were present not only i n the tooth germ but also in the following tissues. (a) Nervous tissue. On the 9th and 10th gestation days the specific spindle cells were present in the neural crest. After the 11th gestation day they were present in the root of the spinal cord, in the spinal ganglia, and in the sympathetic ganglia. They were scattered in the sympathetic nerves, in the spinal nerves, in ccertain cranial nerves, and further in certain cranial ganglia (in ophthalmic, maxillary and mandibular nerves, and semilunar ganglion, jugular ganglion, and superior ganglion). With the advance in stage the specific spindle cells in the above tissues decreased in number. (b) Epithelium and mesenchy m e. In the trunk ; in the ectoderm composed of one or two cell layers in the trunk, the specific spindle cells were situated parallel to the body surface and they were scattered in the sparse mesenchyme. In the cranial part ; the specific spindle cells were present in the epithelium thickened locally organized by several cell layers, in the underlying mesenchyme, and in the boundaries between the epithelium thickened locally and the mesenchyme. Further, they were present in the epithelium composed of two or three cell layers and in the underlying mesenchyme, and further they were present beneath the epithelial cell layers and parallel to it. (c) Others. The specific spindle cells were present in the mesenchyme adjacent to the neural crest and along the dorsal aorta on the 9th and 10th gestation days. They were present in the meninges on the 11th and 12th gestation days. Besides, the specific spindle cells were recognized in the retina, epithelium of lens, perichondrium, mesenteries, and coelomic linings, and further they were present along the blood vessels in the mesenchyme. (3) On the basis of availa b le evidence, it seems likely that the specific spindle cells are the neural crest cells.
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