Archive image from page 119 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 106 NORMAL ANATOMY OF THE LARYNX. thick, almost quadrangular-shaped muscles, situated on each side of the anterior part of the larynx: they arise from the anterior and inferior surface of the cricoid cartilage, on each side of the median line. The fibres are fleshy : the most internal directed obliquely upwards and outwards (m, Jig. 25), the central very Fig. 25. Fig. 26. A side view of the larynx with the os hyoidei attached, a, the thyro-hyoideus muscle;
Archive image from page 119 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana03todd Year: 1847 106 NORMAL ANATOMY OF THE LARYNX. thick, almost quadrangular-shaped muscles, situated on each side of the anterior part of the larynx: they arise from the anterior and inferior surface of the cricoid cartilage, on each side of the median line. The fibres are fleshy : the most internal directed obliquely upwards and outwards (m, Jig. 25), the central very Fig. 25. Fig. 26. A side view of the larynx with the os hyoidei attached, a, the thyro-hyoideus muscle; b, the middle thyro-hyoid ligament; e, the pomum ; d, the crico- thyroid ligament; m, the crico-thyroid muscle; O N, the direction of the inferior fibres of the crico- thyroid lying nearly perpendicular to the axis of the crico-thyroid articulation ; f, the trachea ; n n, the insertion of the thyro-hyoid muscle and mem- brane to the inner margin of the os hyoides. obliquely, and the inferior almost horizontally to the inferior margin of the thyroid and to the inferior horn : others are inserted into the pos- terior surface of the thyroid. A portion of this muscle is prolonged to the inferior constrictor of the pharynx. Each crico-thyroid muscle is covered by the sterno-thyroideus, and lies external to the crico- arytenoid lateralis and the thyro-arytenoideus. The triangular space between the crico-thyroidei is occupied by the crico-thyroid membrane. The action of the crico-thyroidei is to rotate the cricoid on the thyroid. The superior and middle fibres are at the greatest distance from the axis of rotation (N, Jig. 26), and conse- quently acting as if at the arm of a long lever. In this action the anterior superior margin of the cricoid is elevated towards the inferior edge of the thyroid from/to/' (Jig. 26), by which the posterior upper margin of the cricoid is carried backwards from B to B' indicated by the dotted line 1, 2, 3, 4, 5, (fg. 26), and as the space is greater
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