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Medical Definition of Mesenchymal cells
1. Fusiform or stellate cell's found between the ectoderm and endoderm of young embryos; the shape of the cell's in fixed material is indicative of the fact that in life they were moving from their place of origin to areas where they would become reaggregated and specialised; most mesenchymal cell's are derived from established mesodermal layers, but in the cephalic region they also develop from neural crest or neural tube ectoderm; they are the most strikingly pluripotential cell's in the embryonic body, developing at different locations into any of the types of connective or supporting tissues, to smooth muscle, to vascular endothelium, and to blood cells. (05 Mar 2000)