Renal cortex Juxtamedul Nephron tubule Bowman's Blood flow FIGURE 55.13 Nephrons are the structural components of the kidney. (a) The position of nephrons in the mammalian kidney, Cortical nephrons are located predominantly in the renal cortex, while juxtamedullary nephrons have long loops that extend deep into the renal medulla.(b)An expanded view of the relationship between the glomerular capillaries and Bowman's capsule of a nephron tubule