Atlas and abstract of the diseases of the larynx / L. Grünwald ; edited by Charles P. Grayson.

  • Grünwald, L.
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: Atlas and abstract of the diseases of the larynx / L. Grünwald ; edited by Charles P. Grayson. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    In like manner the superior thyro-arytenoid muscles contract the ventricular bands within which they are en- closed ; this happens regularly in swallowing, but only exceptionally in speaking. The actions of the several muscles will be better under- stood by the aid of the following diagram : f\Cs / ct' lot 1 ct 8, thyroid cartilage, A, cricoid cartilage, both cut in a mesial sagittal plane. G, arytenoid cartilage, ct, direction of pull of the cricothyroid muscle. Action: approxima- tion of anterior inferior margin of thyroid, and upper border of cricoid cartilages, ct', direction in which the upper border of the thyroid is at the same time tilted for- ward. st, direction of pidlf.of«the sternothyroid muscle. Action: to depress the awooia cartilage, st', direction in w hich the upper border of the ericntcl is at the same time tilted backward. /*y**» tai, direction of pull of the inferior thyro-arytenoid. Schema (Fig. 3) of the action of muscles on the arytenoid cartilage and on the true vocal cords. Both parts in hori- zontal section and in respiratory position. The cords are seen to consist of a ligamentous, and a cartilaginous por- tion (pi and pc). According to their respective functions,