A text book of physiology . processus vocales;these names however are not free from objections. In quiet breathing(fig. 72 B) the two form together a V-shaped space, which, as we have 602 THE VOICE. [Book hi. seen (p. 306), in deep inspiration is widened into a rhomboidal open-ing by the divergence of the processus vocales (fig. 72 C). When anote is about to be uttered, the vocal cords are by the approxima-tion of the processus vocales brought into a position parallel to eachother, and the whole rima is narrowed (fig. 12 A). By their paral-lelism and by the narrowness of the interval between t
A text book of physiology . processus vocales;these names however are not free from objections. In quiet breathing(fig. 72 B) the two form together a V-shaped space, which, as we have 602 THE VOICE. [Book hi. seen (p. 306), in deep inspiration is widened into a rhomboidal open-ing by the divergence of the processus vocales (fig. 72 C). When anote is about to be uttered, the vocal cords are by the approxima-tion of the processus vocales brought into a position parallel to eachother, and the whole rima is narrowed (fig. 12 A). By their paral-lelism and by the narrowness of the interval between them the cordsare rendered more susceptible of being thrown into vibration by amoderate blast of air. The problems we have to consider are, first,by what means are the cords brought near to each other or drawnasunder as occasion demands; and secondly, by what means is thetension of the cords made to vary. We may speak of these twoactions as narrowing or widening of the glottis, and tightening orrelaxation of the vocal Fig. 72. The Larynx as seen by means op the Laryngoscope in different condi-tions of the Glottis. (From Quains Anatomy after Czermak.) A while singing a high note ; B in quiet breathing; G during a deep inspira-tion. The corresponding diagrammatic figures Af, B, C, illustrate the changesin position of the arytenoid cartilages, and the form of the rima vocalis andrima respiratoria in the above three conditions. I the base of the tongue; e the upper free part of the epiglottis; e the tubercle orcushion of the epiglottis; ph. part of the anterior wall of the pharynx behindthe larynx; w swelling in the aryteno-epiglottidcan fold caused by the cartilageof Wrisberg; s swelling caused by the cartilage of Santorini; a the summit ofthe arytenoid cartilage; cv the true vocal cords; cvs the false vocal cords;tr the trachea with its rings; b the two bronchi at their commencemer Chap, vii.] SPECIAL MUSCULAR MECHANISMS. 603 Narrowing of the Glottis. The change of form of
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