. The anatomy of the horse, a dissection guide. Horses. 230 THE ANATOMY OF THE HORSE. Action.—The muscle acts on the crico-arytenoid joint in a manner antagonistic to the preceding muscle, approximating the vocal cords and narrowing the glottis by swinging the arytenoid cartilage inwards. The Arttbnoideus Muscle (Fig. 28). This may be regarded either as a single muscle, or as a double muscle whose right and left fibres meet at a median Its fibres are inserted on each side into the pos- terior surface of the arytenoid cartilage, and superiorly it is joined by the higher fibres of the th
. The anatomy of the horse, a dissection guide. Horses. 230 THE ANATOMY OF THE HORSE. Action.—The muscle acts on the crico-arytenoid joint in a manner antagonistic to the preceding muscle, approximating the vocal cords and narrowing the glottis by swinging the arytenoid cartilage inwards. The Arttbnoideus Muscle (Fig. 28). This may be regarded either as a single muscle, or as a double muscle whose right and left fibres meet at a median Its fibres are inserted on each side into the pos- terior surface of the arytenoid cartilage, and superiorly it is joined by the higher fibres of the thyro-arytenoid muscle. Action.—To approximate the right and left arytenoid cartilages, and thus narrow the glottis. NERVES OF THE LARYNX. Two nerves are distributed to the larynx—the superior and inferior laryn- geal nerves. The latter is also known as the recurrent nerve, and both are branches of the vagus, or 10th cranial nerve. The Superior Laryngeal Nerve has its origin described at page 194. It gives motor filaments to the crico-thyroid and crico-pharyngeus muscles ; and then trating the thyroid wing by the foramen near its supero-posterior angle, the nerve splits into sensory branches distributed to the mucous membrane of the larynx, giving also twigs to the lining of the pharynx and oesophagus. The Inferior Laryngeal (Eecurrent) Nerve has its origin and course described at page 149. It is the motor nerve to all the intrinsic muscles except the crico-thyroid, and it also gives some sensory twigs to the laryngeal mucous membrane. ^. Fig. 28. Larynx, Back View. I. Epiglottis; 2. Arytenoid Carti- lage ; 3. Thyroid Cartilage; 4. Ary- tenoideus ; 5. Crico-Arytenoideus Pos- ticus ; 6. Cricoid Cartilage; 7. 1st Ring of Trachea; 8. Thyroid Body. INTERIOR OF THE LARYNX. —A vertical incision should be made along the middle line of the larynx behind, severing the arytenoideus muscle and the bezel of the cricoid cartilage. By separating the lips of this inci
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Keywords: ., bookcentury1800, bookdecade1880, booksubjecthorses, bookyear1884
