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arcuate zone

n.
  1. The inner third of the basilar membrane of the cochlear duct, from the tympanic lip of the osseous spiral lamina to the outer pillar cell of the spiral organ.zona tecta
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.