. The anatomy of the domestic animals. Veterinary anatomy. 520 RESPIRATORY SYSTEM OF THE HORSE The arytenoideous transversus (M. arytfenoideus transversus) is an unpaired muscle which stretches across the concave dorsal surface of the arytenoid cartilages. Its fibers are attached on either side to the processus muscularis and the ridge which extends forward from it. The right and left parts of the muscle meet at a fibrous raphe, which is coimected with the transverse arytenoid ligament. Fibers of the ventricularis muscle overlap its anterior part. It narrows the rima by draw- ing the arytenoid
. The anatomy of the domestic animals. Veterinary anatomy. 520 RESPIRATORY SYSTEM OF THE HORSE The arytenoideous transversus (M. arytfenoideus transversus) is an unpaired muscle which stretches across the concave dorsal surface of the arytenoid cartilages. Its fibers are attached on either side to the processus muscularis and the ridge which extends forward from it. The right and left parts of the muscle meet at a fibrous raphe, which is coimected with the transverse arytenoid ligament. Fibers of the ventricularis muscle overlap its anterior part. It narrows the rima by draw- ing the arytenoid cartilages together (adduction). The ventricularis^ lies in the lateral wall of the larynx, covered by the lamina of the thyroid cartilage. It arises from the anterior part of the crico-thyroid membrane and the ventral border of the thyroid lamina. Its fibers pass upward and backwartl Salpingo-pharyngcal fold Epiglottis Aryteno-epiglottic fold. Root of tongue Soft palate {cut) Wall of pharynx Arytenoid cartilage {apex) Posterior pillar of soft palate Position of cricoid cartilage under oesophagus Thyroid gland Trachea - Oesophagus Fig. 463.—Aditus Lartngts of HnnaE, Exposed by Opening Pharynx ani Median Dorsal Line. 1, False vocal cord; ^, lateral ventricle; 3, true vocal cords Beginning of (Esophagus Along 4, rima glottidis. to end partly on the processus muscularis, partly on the arytenoideus transversus, meeting its fellow. The vocalis' is also medial to the lamina of the thyroid cartilage, and is in part separated from the preceding muscle by the laryngeal saccule. It has an extensive origin on the crico-thjToid membrane. Its direction corresponds with that of the true vocal cord. It is inserted into the lateral surface of the arytenoid cartilage below the processus muscularis. The two preceding muscles close the rima glottidis antl slacken the vocal cords. With the arytenoideus transversus and cri'co-arytenoideus lateralis they form a sphincter which closes the entrance
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