. Human physiology. Fig. 217.—Three Views of theLarynx during Life, as seenby looking down the throatwith the aid of the Laryngo-scope. A, during the sing-ing of a high note; B,during quiet breathing;C, while taking a very deepbreath. I, base of the tongue; e, upper freepart of the epiglottis ; e1, lower por-tion of the epiglottis ; pk, front wallof the pharynx behind the larynx ;a, tip of the arytenoid cartilage ;cv, vocal cords ; cus, superior or falsevocal cords, which do not aid in theproduction of the voice; tr, frontwall of the trachea ; b, commence-ment of the two bronchi. The contracti
. Human physiology. Fig. 217.—Three Views of theLarynx during Life, as seenby looking down the throatwith the aid of the Laryngo-scope. A, during the sing-ing of a high note; B,during quiet breathing;C, while taking a very deepbreath. I, base of the tongue; e, upper freepart of the epiglottis ; e1, lower por-tion of the epiglottis ; pk, front wallof the pharynx behind the larynx ;a, tip of the arytenoid cartilage ;cv, vocal cords ; cus, superior or falsevocal cords, which do not aid in theproduction of the voice; tr, frontwall of the trachea ; b, commence-ment of the two bronchi. The contraction of muscles connecting the thyroid with the arytenoidcartilages (the thyro-arytenoid muscles) causes them to approach each other, THE VOICE 225 and so relaxes the vocal cords. When the crico-thyroid muscles contract,they cause the cricoid cartilage to rotate in such a manner as to tilt thearytenoid cartilages backward, and so to put the cords on the stretch. Othermuscles are so arranged that they pull asunder th
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