<Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> Papillary (collecting) ducts are anatomical structures of the kidneys, previously known as the ducts of Bellini . Papillary ducts represent the most distal portion of the collecting duct system . They receive renal filtrate (precursor to urine) from several medullary collecting ducts and empty into a minor calyx . Papillary ducts continue the work of water reabsorption and electrolyte balance initiated in the collecting tubules . </P> <P> Medullary collecting ducts converge to form a central (papillary) duct near the apex of each r enal pyramid . This "papillary duct" exits the renal pyramid at the renal papillae . The renal filtrate it carries drains into a minor calyx as urine . </P> <P> The cells that comprise the duct itself are similar to rest of the collecting system . The duct is lined by a layer of simple columnar epithelium resting on a thin basement membrane . The epithelium is composed primarily of principle cells and α - intercilated cells. 383 </P>

The papillary ducts in the renal medulla lead to a renal
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