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.
It is formed by nine cartilages (see cartilages of the larynx): These cartilages are connected to each other by muscles and ligaments and lined with mucous membrane. Movement of the cartilages alters the tension of the vocal folds, which changes the pitch of the sound emitted by the vocal folds when they vibrate. The larynx is the upper, expanded portion of the trachea which is specially modified for the production of the voice.