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Medical Definition of Crura membranacea ampullaria ductus semicircularis
1. The dilated ends of the three semicircular ducts, each of which contains a specialised thickening of the epithelium known as the ampullary crest. Synonym: crura membranacea ampullaria ductus semicircularis, ampullary limbs of semicircular ducts. (05 Mar 2000)