isthmus of auditory tube
Medical Dictionary

isthmus of auditory tube n.
The narrowest portion of the auditory tube at the junction of the cartilaginous and bony portions. Also called isthmus of eustachian tube.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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