FIGURE 12.

Diagram representation of the tubulovascular arrangement at the largest transverse level in and around a vascular bundle (VB). The red dashed circle indicates the VB core in which the descending vasa recta (DVR) and ascending vasa recta (AVR) are marked in solid red and blue, respectively. I–III represent the three types of short-looped nephrons (SLN) to show their locations. The yellow dashed curve outlines the long-looped nephron (LLN) thick ascending limbs (TAL) at the margin of the VB. The proportions of the various structures are based on the tracing data. DTL, descending thin limb. [From Ren et al. (574) with permission.]