. The comparative anatomy of the domesticated animals. Veterinary anatomy. RESPntATOBT APPARATUS IN MAMMALIA. by proper muscles, which either produce its total displacement, or cause the several cartilages to play upon each other. Among these muscles there are three extrinsic—the sterno-thyroideus, hyo-thyroideus, and the hyo-epiglottidem. The others are intrinsic, or attached in their origin and termination to the different pieces of the larynx ; they are—the crico-thijroid, posterior crico-arytmioid, lateral crico-arytmwid, thyro-arytmnoid, and the arytCRnoideus muscles. All are pairs, excep
. The comparative anatomy of the domesticated animals. Veterinary anatomy. RESPntATOBT APPARATUS IN MAMMALIA. by proper muscles, which either produce its total displacement, or cause the several cartilages to play upon each other. Among these muscles there are three extrinsic—the sterno-thyroideus, hyo-thyroideus, and the hyo-epiglottidem. The others are intrinsic, or attached in their origin and termination to the different pieces of the larynx ; they are—the crico-thijroid, posterior crico-arytmioid, lateral crico-arytmwid, thyro-arytmnoid, and the arytCRnoideus muscles. All are pairs, except the last and the hyo-epiglottideus. Sterno-thyroideus.—(See p. 255.) Hyo-thyroideus (Fig. 314, 3).—This is a wide, triangular muscle, formed entirely of muscular fasciculi, wliich arise from the whole extent of the hyoid cornu, and terminate on the external face of the thyroid ala ; the most inferior are longest. This muscle covers the Fig. 3U. thjToid cartilage and the thyro- hyoid membrane. It is covered by the maxillary gland.^ In contracting, this muscle brings the thyroid cartilage within the branches of the hyoid bone, and in this way carries the larynx for- ward and upward. Hyo-epiglottideus.—This is a small cylindrical fasciculus, the fibres of which are buried in the middle of a mass of adipose tissue, and extend from the superior sur- face of the body of the hyoid bone to the antero-inferior face of the epiglottis. Partly covered by the mucous membrane of the pharynx, this muscle concurs in restoring the epiglottis to its normal position after the passage of food or water over it. But it is also necessary to state that the epiglottis is carried forward more particularly by its o^vn proper elasticity, as well as that of the Ugamentous bands that attach it to the thyroid cartilage. Crico-thyroideus (Figs. 314, 11 ; 315, 8).—This small muscle, applied to the external side of the cricoid cartilage, is elongated from above to below, and composed of somewhat t
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