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A cell type different from the follicular cells of the thyroid was discovered by BABER (1876) and named "parafollicular cell" by NONIDEZ (1932). As to the function of this cells, different opinions were proposed. It was regarded, for instance, as a degenerated follicular epithelial cell, an undifferentiated follicular epithelial cell, a neuroepithelial cell without any relationship to the folli...

The too general definition established by Bertalanffy L. (1968), has been used as the only system concept from 1968 to date and this led publication of many unscientific statements, which have never verified with reality which, nevertheless , continue be accepted a basis for reasoning explanatory arguments real situations. Here, is proposed that effectively replaces allows explain in logical, s...

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