. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1478 VOICE. throat. In this case the larynx was divided immediately above the vocal cords, and in consequence of the oblique direction of the wound, the arytenoid cartilage and the vocal cord on one side were injured. During respiration the glottis was observed to assume a triangular form, but when a sound was uttered, the chordee vocales became nearly parallel, and the rima glottidis of a linear ibrm. The posterior part of the aperture did not appear to be closed. In a second case of this kind, he observed that the aryt
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 1478 VOICE. throat. In this case the larynx was divided immediately above the vocal cords, and in consequence of the oblique direction of the wound, the arytenoid cartilage and the vocal cord on one side were injured. During respiration the glottis was observed to assume a triangular form, but when a sound was uttered, the chordee vocales became nearly parallel, and the rima glottidis of a linear ibrm. The posterior part of the aperture did not appear to be closed. In a second case of this kind, he observed that the aryte- noid cartilages, as long as the vocalization of the breath continued, maintained the position which they had assumed when the glottis was closed entirely.* The vibrations of the thyro-arytenoid ligaments are considered by Ferrein-f- to be analogous to those of strings ; hence he denominated these ligaments (though improperly) chorda; vocales. He imagined that the longitudinal tension of these cords alone governed the pitch of the voice. Mr. Willis j has embraced the hypothesis of Ferrein ; he observes, that to obtain the various notes of the glottis, it is only ne- cessary to vary its longitudinal tension after the ligaments have been placed in the proper position j but M. Biot § remarks, " Qu'y a-t-il en effet dans la glotte qui ressemble a une corde vibrante? Comment pourroit-on en tirer jamais des sons d'un volume com- parable a ceux que 1'homme produit ? Les plus simples notions d'acoustiques suffisent pour faire rejeter cette etrange ; On inspecting the larynx from above, we see two very nearly rectangular-shaped la- minae, one on each side of the chink of the glottis, but nothing resembling an isolated cord. The mucous membrane which lines the thyro-arytenoid ligaments (to which it closely adheres), as well as the rest of the vocal tube, must be considered as forming a part of the weight of the vibrating surface upon which the air acts ; the thyro-a
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