A nephron of the kidney. From gray's anatomy 1918. The illustration includes an important anatomical error in that it fails to depict the distal tubulus (tubulus rectus distalis) passing by vascular pole of the glomerulus before becoming the distal convoluted tubule (tubulus contortus distalis). The distal tubulus together with the afferent arteriole (arteriola afferens) and the extra glomerular mesangial cells together make up the juxtaglomerular apparatus. This occurs in all nephrons but was not known in 1918. Date: 1918.
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