tonotopic

[tō′nə-tŏpĭk]
adj.
  1. Of or being a structural arrangement, as in the auditory pathway, such that different tone frequencies are transmitted separately along specific parts of the structure.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.