ampullary crest

[ămpə-lĕr′ē]
n.
  1. An elevation on the inner surface of the ampulla of each semicircular duct, through which filaments of the vestibular nerve pass to reach hair cells on the surface.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.