vocal cords


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vocal cords:

see larynxlarynx
, organ of voice in mammals. Commonly known as the voice box, the larynx is a tubular chamber about 2 in. (5 cm) high, consisting of walls of cartilage bound by ligaments and membranes, and moved by muscles. The human larynx extends from the trachea, or windpipe.
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Vocal cords

The pair of elastic, fibered bands inside the human larynx. The cords are covered with a mucous membrane and pass horizontally backward from the thyroid cartilage (Adam's apple) to insert on the smaller, paired arytenoid cartilages at the back of the larynx. The vocal cords act as sphincters for air regulation and may be vibrated to produce sounds. Separation, approximation, and alteration of tension are produced by action of laryngeal muscles acting on the pivoting arytenoids. Vibration of the cords produces fundamental sounds and overtones. These can be modified by the strength of the air current, the size and shape of the glottis (the opening between the cords), and tension in the cords. See Larynx, Speech

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The global vocal cord paralysis market is expected to exhibit a 3.8% CAGR from 2018 to 2023 (forecast period), as per the latest report by Market Research Future (MRFR) owing to prevalence of brain disorders.
Caption: Voice disorders can result from a number of problems affecting the vocal cords, larynx (voice box) and other structures in the throat and elsewhere.
A needle canal is created on the thyroid lamina for the upper stitch (stitch above the vocal cord) at the previously measured point [Figure 2]A: a].
Of these 18 patients, seven were evaluated; five patients were found to be normal and two patients had vocal cord paralysis.
Conclusion: Vocal cord paralysis is a common clinical condition with substantial morbidity.
Other causes of VCP like traumatic or forceps delivery, mediastinal surgery, and ligation of patent ductus arteriosus, brainstem anomalies, and intracranial bleeding were not present in our case, and hence the diagnosis of idiopathic congenital bilateral vocal cord paresis was made.
We also hypothesized that in patients with bilateral vocal cord paralysis the quality of voice and speech is significantly lower compared to the healthy subjects.
Flexible laryngoscopy revealed large bilateral vocal cord polyps causing almost complete airway obstruction.
A fibronasolaryngoscopy showed arythenoidal and vocal cord edema (ventricular bands) with incomplete left vocal cord abduction.
A Vocal cords lose muscular strength and their elasticity with age, making the voice sound weaker.
The mean distance from the tube tip to the carina and that from the vocal cords to tube cuff were compared between the control and experimental tests in each group.
A thorough clinical workup of all the patients was done (detailed history, general physical and systemic examination, complete nasal and paranasal sinuses examination, examination of ears, examination of larynx, external examination for obvious swelling, mobility of the laryngeal framework, laryngeal crepitus, tenderness, laryngeal expansion, and indirect laryngoscopy to examine posterior one-third of the tongue, valleculae, epiglottis, aryepiglottic folds, vestibular folds, vocal cords, pyriform fossae, and movements of the vocal cords).