Diseases of the nose and throat; a text-book for students and practitioners . Fig. 88.—Posterior Crico-Abytenoid Muscles. (Fioixi a photograph ) ANATOMY AND PHYSIOLOGY OF THE LARYNX. 329 of tlie corresponding arytenoid cartilage. Contraction of thesemuscles rotates the arytenoids m such a way that the muscularprocesses are approximated and the vocal processes and bandsseparated. In rare cases there is an extra muscle, very smalland often unilateral—the IceratOCricoid. It arises near the originof the posterior crico-arytenoid, and passes upward and out-ward to the posterior margin of the inferi
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Diseases of the nose and throat; a text-book for students and practitioners . Fig. 88.—Posterior Crico-Abytenoid Muscles. (Fioixi a photograph ) ANATOMY AND PHYSIOLOGY OF THE LARYNX. 329 of tlie corresponding arytenoid cartilage. Contraction of thesemuscles rotates the arytenoids m such a way that the muscularprocesses are approximated and the vocal processes and bandsseparated. In rare cases there is an extra muscle, very smalland often unilateral—the IceratOCricoid. It arises near the originof the posterior crico-arytenoid, and passes upward and out-ward to the posterior margin of the inferior thyroid horn. Itsfunction is doubtful, but may aid in fixing the inferior cornu, opposing, to a slight degree, the fibres of the crico-thyroidwhich pass to the anterior margin of the horn. The lateral crico-arytenoid (adductor) muscles pass (Fig. 89)from the upper margin and outer ftice of the sides of the cricoid Arr-cpifrlottic fold Cartilage of Sautorini Pyriform sinus Arvtenoidens muscle Left posterior crico-arytenoid muscle Cricoid cartilage. EpiglottisArytenoid cartilageThyro-ary-epiglottic musclesRight posterior crico-arytenoid muscle Key to Fig. 88. cartilage, upward and backward to the anterior portion of themuscular process of the corresponding arytenoid cartilage. Theiraction is directly antagonistic to that of the posterior crico-arytenoids ; after the latter muscles open the glottis (the spacebetween the vocal bands) to allow the passage of air, the lateralmuscles are those which chiefly narrow that space preparatoryto voice production. The arijtenoideus^ or transverse (adductor), is a broad, flatmuscle (Fig. 88) attached to the posterior surfaces of the aryte-noids. It passes transversely from one cartilage to the other; itcloses the posterior (cartilaginous) portion of the rima glottidis.In this way it assists the lateral crico-arytenoid muscles, for, while the latter close the vocal bands from the anterior tips of 330 DISEASES OF THE NOSE AND THROAT. the vo