A treatise on the diseases and injuries of the larynx and trachea : founded on the essay to which was adjudged the Jacksonian prize for 1835 / by Frederick Ryland.

  • Ryland, Frederick (Surgeon)
Date:
1837
Catalogue details

Licence: Public Domain Mark

Credit: A treatise on the diseases and injuries of the larynx and trachea : founded on the essay to which was adjudged the Jacksonian prize for 1835 / by Frederick Ryland. Source: Wellcome Collection.

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

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    fibres run parallel to the vocal cords, have a strong connection with them, and terminate posteriorly by an attachment to the base of the front edge of the arytaenoid cartilages ; by drawing forwards these cartilages, they shorten the vocal ligaments, and in some degree widen the rima glottidis; and, inasmuch as the arytae- noids are firmly fixed to the cricoid by a strong ligament posteri- orly, these muscles will act as antagonists to the crico-thyroidei, and will raise the thyroid cartilage, and thus increase the crico-thy- roid space, and put the membrane in that situation on the stretch. The (yrico-arytcEUoidei postici.—These muscles arise from the depression found on each side of the salient line at the back of the cricoid cartilage ; they are inserted into the base of the posterior surface of the aryta5noid cartilages. They widen the rima glottidis by separating the arytsenoid cartilages. The crico-ari/tcsnoidei laterales have their origin from the supe- rior circumference of the cricoid cartilage, their fibres proceeding upwards and backwards, are fixed to the base of the arytsenoid. Their use is also to widen the aperture of the glottis. The muscles principally instrumental in closing the vocal aper- ture are the arytcenoidei transversi and ohliqui, the former of which are the more external. The fibres of these muscles pass from one arytcienoid cartilage to the other. A few muscular bands can sometimes be traced going from the arytsenoid to the sides of the epiglottis, but they are unimportant and not always present. The larynx is supplied with blood by branches from the thyroid arteries ; one vessel constantly found is the crico-thyroid artery, which ramifies on the membrane of that name. Its nerves are derived from the eighth pair, and from the cervical ganglia of the sympathetic. The inferior laryngeal, or recurrent nerves, supply only the crico-arytenoidei postici and laterales and the thyro-arytenoidei muscles, which are the dilators of the glottis, and also the mucous membrane covering the posterior part of the larynx.* The superior • Meckel and Quain speak also of brandies to the aryttcnoidci muscles: