Laryngoscopic view of the vocal folds. (Vestibular fold labeled at center right.)
Cut through the larynx of a horse:
1 hyoid bone 2 epiglottis 3 vestibular fold, false vocal fold/cord, (Plica vestibularis) 4 vocal fold, true vocal fold, (Plica vocalis) 5 Musculus ventricularis 6 ventricle of larynx (Ventriculus laryngis) 7 Musculus vocalis 8 Adam's apple (thyroid cartilage) 9 rings of cartilage (cricoid cartilage) 10 Cavum infraglotticum 11 first tracheal cartilage12 Windpipe (Trachea)
|Latin||Plica vestibularis, plica ventricularis|
The vestibular fold (ventricular fold, superior or false vocal cord) is one of two thick folds of mucous membrane, each enclosing a narrow band of fibrous tissue, the vestibular ligament, which is attached in front to the angle of the thyroid cartilage immediately below the attachment of the epiglottis, and behind to the antero-lateral surface of the arytenoid cartilage, a short distance above the vocal process.
The vestibular folds of the larynx play a significant role in the maintenance of the laryngeal functions of breathing and preventing food and drink from entering the airway during swallowing. They aid phonation (speech) by suppressing dysphonia. In some ethnic singing and chanting styles, such as in Tibet and Mongolia, the vestibular folds may be used in co-oscillation with the vocal folds, producing very low pitched sounds. Conversely, people who have had their epiglottis removed because of cancer do not choke any more than when it was present.  
Society and culture
They have a minimal role in normal phonation but, are often used to produce deep sonorous tones in Tibetan chant and Tuvan throat singing, as well as in musical screaming and the death growl singing style used in various forms of metal. Simultaneous voicing with the vocal and vestibular folds is diplophonia. Some voice actors occasionally employ small amounts of this phonation for its dark, growling quality while portraying a "villainous" or antagonistic voice.
- Vestibular fold flap for post-cordectomy laryngeal reconstruction; Mamede, Ricz, Aguiar-Ricz, Mello-Filho; Abstract
- A self-sustained vocal-ventricular phonation mode: acoustical, aerodynamic and glottographic evidences ; L Fuks, B Hammarberg, J Sundberg; ; "Trans-oral partial epiglottidectomy to treat dysphagia in post-treatment head and neck cancer patients"; Jamal, Erman, Chhetri; 
- Fuks, Leonardo (1998), From Air to Music: Acoustical, Physiological and Perceptual Aspects of Reed Wind Instrument Playing and Vocal-Ventricular Fold Phonation, Stockholm, Sweden, retrieved 2010-01-05
- lesson11 at The Anatomy Lesson by Wesley Norman (Georgetown University) (larynxsagsect, larynxmembranes)
- Atlas image: rsa3p14 at the University of Michigan Health System - "Larynx, lateral view"
- Atlas image: rsa3p15 at the University of Michigan Health System - "Larynx, laryngoscopic view"
- Anatomy photo: respiratory/airways/larynx1/larynx4 - Comparative Organology at University of California, Davis