true vocal cords

plural noun Anatomy.
  1. the lower pair of vocal cords, the edges of which can be made to tense and relax by the passage of air from the lungs, thus producing vocal sound.
Also called vocal folds.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

vocal fold in Medicine

vocal fold

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