In the kidney, the collecting tubule (CNT, or junctional tubule) is a tubular segment of the renal collecting duct system that connects the distal convoluted tubule to the cortical collecting duct. Some connecting tubules, usually associated with juxtamedullary nephrons, arch upwards before reaching the cortical collecting ducts. Because of this arch, the connecting tubule is sometimes called the arcuate renal tubule or tubulus renalis arcuatus. It participates in the regulation of water and electrolytes, including sodium, and chloride. The CNT is sensitive to both isoprotenerol (more so than the cortical collecting ducts) and antidiuretic hormone (less so than the cortical collecting ducts), the latter largely determining its function in water reabsorption.

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External links

• Image at Medical College of Georgia
• Types of tubules
• Diagram (#31)

Kidney