Divisions
The proximal tubule as a part of the nephron can be divided into two sections, pars convoluta and pars recta. Differences in cell outlines exist between these segments, and therefore presumably in function too.
Regarding ultrastructure, it can be divided into three segments, S1, S2, and S3:
| Segment | Gross divisions | Ultrastructure divisions | Description |
| Proximal tubule | convoluted | S1 | Higher cell complexity |
| S2 | |||
| straight | |||
| S3 | Lower cell complexity |
Read more about this topic: Proximal Convoluted Tubule
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