title: Laryngeal adduction asymmetries in normal speaking subjects.
abstract: To investigate the prevalence of asymmetries at vocal fold adduction, 109 vocally healthy subjects between 22 and 80 years of age were examined. All subjects were examined with a rigid endoscope and video recorded. The recordings were analysed off line by two laryngologists. Seventy percent of the subjects displayed some kind of asymmetry. There was no difference between the sexes. Side differences in antero-posterior position of the corniculate or cuneiform tubercles were the most frequent asymmetries, occurring in 66% of the total material and in 92% of the asymmetrical cases. Asymmetries appeared more common and more marked in older subjects and possibly more frequent in singers than in non-singers. Laryngeal adduction asymmetries are probably of little importance for voice function.
authors.affiliation: Department of Logopedics and Phonatrics, Huddinge University Hospital, Stockholm, Sweden. Per-ake.lindestad@kus.se
authors.forename: Per-Ake
authors.initials: PA
authors.lastname: Lindestad
authors.forename: Stellan
authors.initials: S
authors.lastname: Hertegård
authors.forename: Gunnar
authors.initials: G
authors.lastname: Björck
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D001193:Arytenoid Cartilage / Q000033:anatomy & histology / Q000503:physiopathology; D016009:Chi-Square Distribution; D004825:Epiglottis / Q000033:anatomy & histology / Q000503:physiopathology; D005260:Female; D006801:Humans; D007828:Laryngoscopy; D007830:Larynx / Q000033:anatomy & histology / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D014741:Video Recording; D014827:Vocal Cords / Q000033:anatomy & histology / Q000502:physiology; D014831:Voice / Q000502:physiology*