Physiology and biochemistry in modern medicine . narrow twisted neck into a tubule, which israther tortuous in the cortex (the proximal convoluted tubule), but soontakes a sharp descending course in the medulla towards the pelvis of thekidney, and doubles back (loop of Henle) in a straight course again tothe cortex, where it again makes a twisted course (the distal convolutedtubule), and terminates in a collecting tubule, which, uniting with othertubules, collects the urine and conducts it to the pelvis of the capsule is lined with very thin epithelial cells, especially over thecapi
Physiology and biochemistry in modern medicine . narrow twisted neck into a tubule, which israther tortuous in the cortex (the proximal convoluted tubule), but soontakes a sharp descending course in the medulla towards the pelvis of thekidney, and doubles back (loop of Henle) in a straight course again tothe cortex, where it again makes a twisted course (the distal convolutedtubule), and terminates in a collecting tubule, which, uniting with othertubules, collects the urine and conducts it to the pelvis of the capsule is lined with very thin epithelial cells, especially over thecapillaries comprising the glomerulus. The proximal and distal tubules 507 508 THE EXCRETION OF TRINE contain epithelium showing a prominent striation. These striations arerows of granules, which run towards the lumen of the cell, becomingless distinct as they approach it and apparently standing in close rela-tionship to the rather prominent internal (lumen) striated border ofthe cell. Some histologists believe that the striations at the border are. Fig. 170.—Diagram of the uriniferous tubules (C) the arteries (A), and the veins (B) of the kidney. really cilia, which are described as being immobile. The cilia are shownin Fig. 171. The descending limb of Henles loop is lined with a thinpavement epithelium with large bulging nuclei. The distal convolutedtubule is lined with cells not unlike those found in the proximal tubules,except that the inner border is not striated. The diameter of the lumen TIIK OF IKIM: 509 of the capsule varies with the activity of the kidney, as is shown inthe following figures given by Brodie and RESTING KIDNEY DURING KIDNEY DIURESIS MM. MM. Miiin diameter of capsule glomerulus space of capsule Lumen of proximal convoluted tubule distal The urinary tubule has a remarkable Mood supply. The renal arteriesarise directly from the abdominal aorta and are very short. They runthrough the med
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