Figure 10.

The transition zone between the outer and inner medullary regions. Both the outer and inner medulla contain tubules that form the descending thin limb and the ascending thick limb of Henle's loop and the CDs. The thin tubules can be easily distinguished from the thick ascending limbs as the cell height in the thin tubules is very short (~ 1 μm), and the cell height in the thick tubules is much longer (~ 7 μm) (Table 1). Outer medulla is characterized by the presence of thick ascending limbs. A single‐layered epithelial covering is visible at the right edge of this section.