Hair Tonic: What It Is And How To Use It. Hair tonic is an âold schoolâ hair styling product. It makes the hair look glossier (though some say greasier), something which many people viewed as a sign of healthy hair. The oils in the hair tonic also help hold the hair in place, making it easier to style, much like mousse or hair spray.
Larynx. the complex of cartilages, muscles, and ligaments that form the initial section of the trachea in terrestrial vertebrates and man, usually containing the vocal apparatus. The laryngeal cavity is divided into the anterior larynx, or vestibule, and the posterior larynx.
The voice box, or larynx, houses two elastic vocal cords atop the windpipe. The cords close when people swallow, protecting the airway. They open when people breathe. And they come together and vibrate when people speak or sing. Paralysis or weakness of a vocal cord can occur when the nerve that supplies it is damaged. This nerve, the recurrent laryngeal nerve, is famously circuitous, looping down into the chest before heading back up to the voice box.