Spasmodic dysphonia: Spasmodic dysphonia (or laryngeal dystonia) is a voice disorder characterized by involuntary movements or spasms of one or more muscles of the larynx (vocal folds or voice box) during speech.List of voice disorders: Voice disordersTitze, I.R.Dysprosody: Dysprosody, which may manifest as pseudo-foreign accent syndrome, refers to a disorder in which one or more of the prosodic functions are either compromised or eliminated completely.Vocal cord paresisEpineurium: The epineurium is the outermost layer of dense irregular connective tissue surrounding a peripheral nerve. It usually surrounds multiple nerve fascicles as well as blood vessels which supply the nerve.Vocal folds: The vocal folds, also known commonly as vocal cords or voice reeds, are composed of twin infoldings of mucous membrane stretched horizontally, from back to front, across the larynx. They vibrate, modulating the flow of air being expelled from the lungs during phonation.Mallampati scorePosterior cricoarytenoid muscle: The posterior cricoarytenoid muscles are extremely small, paired muscles that extend from the posterior cricoid cartilage to the arytenoid cartilages in the larynx.AphoniaBelting (music): Belting (or vocal belting) is a specific technique of singing by which a singer brings their chest register above its natural passaggio (break) at a loud volume; instead, an alternative production is developed, often described and felt as supported and sustained yelling. 'Belting' is sometimes described as 'high chest voice' but this is technically incorrect and potentially damaging for the voice.Voice changer: The term voice changer (also known as voice enhancer) refers to a system of altering a person's voice to either make them sound like someone else or to disguise their voice.Infraglottic cavity: The infraglottic cavity is the portion of the larynx below the laryngeal ventricles and the rima glottidis.Betamethasone 17-valerateJanwillem van den Berg: Janwillem van den Berg (20 November 1920 in Akkrum – 18 October 1985 in Akkrum) was a Dutch speech scientist and medical physicist who played a major role in establishing the myoelastic-aerodynamic theoryTitze, I. R.SpasmRima glottidis: The rima glottidis is the opening between the true vocal cords and the arytenoid cartilages.Glottis: The glottis is defined as the opening between the vocal folds Ladefoged, Peter. 2006.Henry Meige: Henri Meige (11 February 1866 – 29 September 1940) was a French neurologist born in Moulins-sur-Allier. He characterized Meige's syndrome in 1910.Front vowel: A front vowel is any in a class of vowel sound used in some spoken languages. The defining characteristic of a front vowel is that the tongue is positioned as far in front as possible in the mouth without creating a constriction that would make it a consonant.