Renal calyces (right kidney)

Calices renales majores et minores

UrinaryOrgansAbdomenRight side

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What it is
Minor calyces are cups that clasp each renal papilla; two or three of them join into each of two or three major calyces, which unite to form the renal pelvis.
Function
Collect urine dripping from the papillary ducts and start the peristaltic waves that drive it toward the ureter.
Size
7–14 minor calyces (8 shown) and 2–3 major calyces per kidney.
Clinical note
A "staghorn" calculus is a branched stone that fills the pelvis and calyces like a cast.