. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NORMAL ANATOMY OF THE LARYNX. 107 Fig. 27. Fig. A side view of the larynx, the left wing of the thyroid and the mucous membrane removed, and the fibres of the arytenoid muscle depressed to expose the liga- ments and chink of the glottis. a, the internal surface of the right wing of the thyroid ; b b, the arytenoid cartilages ; c, the thyro- arytenoid ligament; d, the thyro-arytenoideus muscle; d', the thyro-arytenoideus superior vel minor; e e, the crico-arytenoidei postici; f, the crico-arytenoideus lateralis ; n,
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NORMAL ANATOMY OF THE LARYNX. 107 Fig. 27. Fig. A side view of the larynx, the left wing of the thyroid and the mucous membrane removed, and the fibres of the arytenoid muscle depressed to expose the liga- ments and chink of the glottis. a, the internal surface of the right wing of the thyroid ; b b, the arytenoid cartilages ; c, the thyro- arytenoid ligament; d, the thyro-arytenoideus muscle; d', the thyro-arytenoideus superior vel minor; e e, the crico-arytenoidei postici; f, the crico-arytenoideus lateralis ; n, the cricoid carti- lage ; h, the trachea; I, the external prominence of the arytenoid cartilage. attachment or muscles appropriated to fix it as a fulcrum for motions in an opposite sense. The crico-arytenoideus lateralis is an irregu- lar quadrilateral muscle, arising from the supe- rior margin of the cricoid, from thence passing upwards and backwards, (f,fg. 28). It is in- serted into the posterior surface of the external prominence of the arytenoid cartilage by a tendon common to it and the thyro-ary tenoid muscle. It is deeply seated under cover of the thyroid car- tilage and crico-thyroid muscle. The action of this muscle has caused much diversity of opi- nion. Cowper, Ilaller, Magendie, and others consider that it opens the glottis; but Bichat and Soemmering that it closes it. Its action has, however, been mechanically solved in the following manner by Willis. The arytenoid cartilage is loosely fixed to the cricoid by liga- ments already described at B (Jigs. 28 and 29). The direction of the force of this muscle is represented by the line N X (Jig. 30), having its point of insertion into the cricoid about X. The fibres in passing thence to the arytenoid (f, .fig. 28) lie nearly parallel to the projection of the axis of motion, G C ; the tension of this muscle in the direction N X (Jigs. 29 and 30). Please note that these images are extracted from scanned page images that
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