semicircular duct

noun

Medical Definition of semicircular duct 

: any of the three loop-shaped membranous inner tubular parts of the semicircular canals that are about one-fourth the diameter of the corresponding outer bony canals, that communicate at each end with the utricle, and that have near one end an expanded ampulla containing an area of sensory epithelium

called also membranous semicircular canal

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