Homo sapiens collecting duct of renal tubule MESH:D007685 EMAPA:28407 collecting duct ureteric tree TAO:0005294 ZFA:0005294 EV:0100391 kidney collecting duct CALOHA:TS-0860 The collecting duct is a portion of the nephron through which water flows, moving passively down its concentration gradient. SCTID:28202009 GAID:434 Wikipedia:Collecting_tubule FMA:15628 collecting tubule renal collecting tubule in ISBN:0073040584 (Vertebrates, Kardong), the nephron is adjacent to the collecting tubule, consistent with FMA, but not GO. Wikipedia says: Many sources include the connecting tubule as part of the collecting duct system. However, the embryological origin is more similar to the nephron than it is to the rest of the collecting duct (which derives from the ureteric bud), and other sources therefore classify the connecting tubule with the nephron kidney collecting tubule BTO:0000761 MA:0000371 UBERON:0001232 Renal duct that collects the output from renal tubules.[TAO] tubulus renalis arcuatus collecting duct system arcuate renal tubule tubulus renalis colligens junctional tube excretory tube