[Various aspects of renal pyramid collagen seen by scanning electron microscopy]

In apparently normal kidneys, viewed with a scanning electromicroscope, it has been observed that the renal pyramid has a collagen arranged in cells which cover vessels and tubules. These cells vary in arrangement and structure. In spite of the apparent normality, collagen variations are observed. Sometimes as a result of the increased intensity and other times because forms of neocollagen appear with accumulations of essential substances. This fact suggests that the said changes involve two circumstances. Either this tissue changes continuously or the said kidneys have some lesion in their collagen which leads to new forms of neocollagen appearing and to the great richness of essential substances.