It should be possible to find this structure in all slides. It is also very likely that it may take you a few minutes of carefully scanning the tissue at high magnification before you will find it. This fuzzy material represents the remains of the brush border of the cells of the proximal tubules , which is difficult to preserve during the preparation of the tissue . Include a proximal tubulus and a distal tubulus in your drawing. The tubular system can be divided into proximal and distal tubules , which in turn have convoluted and straight portions .
Thin tubules connect the proximal and distal tubules.
The convoluted part of the proximal tubules coils close to the glomerulus in the cortex of the kidney. Their walls are formed by a low columnar epithelium. Sodium ions are actively resorbed from the glomerular filtrate. Sodium ions are followed by passively diffusing chloride ions and the osmotic absorption of water. The straight portion of the proximal tubule descends towards the medulla of the kidney.