Archive image from page 121 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 108 NORMAL ANATOMY OF THE LARYNX. corresponds with the posterior surfaces of the arytenoid cartilages, and is connected by some muscular fibres and membrane with the supe- rior margin of the cricoid cartilage and with the whole length of the internal margins of the arytenoid cartilages. The immediate effect of the contraction of the arytenoid muscles is to approximate the posterior internal surfaces of the arytenoid cartilages, but their action, at the same t
Archive image from page 121 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 108 NORMAL ANATOMY OF THE LARYNX. corresponds with the posterior surfaces of the arytenoid cartilages, and is connected by some muscular fibres and membrane with the supe- rior margin of the cricoid cartilage and with the whole length of the internal margins of the arytenoid cartilages. The immediate effect of the contraction of the arytenoid muscles is to approximate the posterior internal surfaces of the arytenoid cartilages, but their action, at the same time, tends to separate the anterior pro- minences, and to open the chink of the glottis. To counteract this effect the action of the crico- arytenoideus lateralis is called simultaneously into play, and the joint effect of these two muscular forces, represented by the lines N X and NY (Jig. 30,) produce a resultant in the direction of W N; hence the crico-arytenoideus lateralis and the arytenoideus muscle acting together tend to close the glottis posteriorly. The thyro-arytenoideus. — This is one of the most important, most complicated, and perhaps least understood of any of the muscles of the larynx. It arises from the side of the angle of the thyroid cartilage, occupying about two-thirds of its height, and reaches within two or three lines of its superior margin. The central fibres are directed horizontally back- wards and outwards, slightly inclined upwards, and inserted into the prominence and concavity on the lateral surface of the arytenoidf/, Jig. 27). The superior fibres terminate in the external ridge of the arytenoid ; some of them pass round the arytenoid, and enclose the arytenoid muscle like a sphincter. The inferior fibres which arise near the median plane (k, 29) are inserted, at a greater distance from it, into the arytenoid cartilages (f, fig. 30) ; some ex- ternal fibres are directed more eccentrically Fig. 29. Fig. 30. A view of the larynx from above.
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