![]() It is a special network of substances, unique in the body, that can support the stresses of vocal fold vibration over the long term. The pliability of the mucosa depends on the integrity of the layer immediately beneath it, known as the superficial lamina propria, or Reinke’s layer, named after the man who described it. The resulting video creates the impression of watching the vocal folds vibrate in slow motion. A laryngeal stroboscope uses a microphone to detect the frequency of vibration of the vocal folds during phonation, and times the flashing of a stroboscopic light bulb just slightly out of phase with it. In reality, vocal folds vibrate in excess of 100 times per second during voicing, and sometimes many times faster. The videos on this site show vocal fold vibration in slow motion by means of a technique known as stroboscopy. The vocal folds open to allow breathing and close during swallowing to prevent food from entering into the lungs and during voicing. Thus, it is positioned where the airway and the esophagus separate. Only its outer covering vibrates.īiologically, the larynx evolved as a valve to protect the airway and lungs. It resembles a lip of tissue much more than a cord. In fact, the vocal fold is a part of a muscle on the side of the larynx, covered with special tissues that can vibrate at a high speed. ‘Vocal cord’ suggests a band or string suspended in the air that vibrates when it is plucked or struck. 'Vocal fold’ is the modern term for ‘vocal cord.’ The change in terminology came about because of a better understanding of the anatomy and function of the larynx. The vocal folds, together with the muscles and cartilages that support them, are known as the larynx. They are enclosed within the thyroid cartilage, which is the hard structure that forms the mass in the neck known as the Adam’s apple. The vocal folds are a pair of pliable shelves of tissue that stretch across the top of the trachea (windpipe). Voice is produced by vibration of the vocal folds.
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