. Human physiology : designed for colleges and the higher classes in schools, and for general reading. INTERIOR OF THE LARYNX. half of the larynx, the division being made directly down, andfrom front to rear. At t is the front of the thyroid cartilagewith its cut edge; at c c, are the two cut edges of the cricoid,showing how narrow is its front part compared with its broadrear portion ; a is the left arytenoid cartilage, c showing theplace where it is united by a joint to the top of the cricoid ; f isthe trachea; r is the true vocal ligament or chord; v is thespace between this and the upper l
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. INTERIOR OF THE LARYNX. half of the larynx, the division being made directly down, andfrom front to rear. At t is the front of the thyroid cartilagewith its cut edge; at c c, are the two cut edges of the cricoid,showing how narrow is its front part compared with its broadrear portion ; a is the left arytenoid cartilage, c showing theplace where it is united by a joint to the top of the cricoid ; f isthe trachea; r is the true vocal ligament or chord; v is thespace between this and the upper ligament; and e is the epig-lottis which is shut down upon the upper ligaments as a coverby the contraction of the muscle b, just when this is needed. THE VOICE. 253 FIG. Upper and lower ligaments. The lower the true vocal chords. In Fig. 141 is a diagram represent-ing the plan of these two pairs ofligaments, as shown by a perpendic-ular section from side to side. B Brepresents the vocal ligaments, C Cthe upper ligaments, and V V, thetwo recesses between them. 371. We know that it is thelower ligaments that are the truevocal chords, because the partsabove these, even the upper liga-ments, may be all cut away, and yeta vocal sound may be produced ;while if an opening be made intothe larynx below the lower liga-ments the voice will be , a French physiologist,speaks of a man, who on account ofan opening in the larynx was neverable to speak without pressing hiscravat tightly against this opening, in order to prevent the air from escaping through it. Manyexperiments have been tried with the larynx after death toverify the results above stated. The lower ligaments are thenthe vocal chords, by the vibration of which all the differentnotes of
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