spiral crest

n.
  1. The thickened periosteal lining of the bony cochlea forming the outer wall of the cochlear duct to which the basal lamina attaches.spiral ligament of cochlea
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.