. The comparative anatomy of the domesticated animals. Veterinary anatomy. RESPIRATORY APPARATUS IN MAMMALIA. Fig. 311. of the various cartilages (Figs. 312, 314). 4. Prepare the muscles in conformity with the indications furnished by a glance at Fig. 314. 5. Remove a larynx as carefully as possible, 80 as not to injure the walls of the pharynx, in order to study the interior of the organ, and especially its pharyngeal opening (Fig. 315). Form—Situation.—The larynx forms a veiy short canal, which gives admis' sion to the air during respiration, and is at the same time the organ of the voice. I
. The comparative anatomy of the domesticated animals. Veterinary anatomy. RESPIRATORY APPARATUS IN MAMMALIA. Fig. 311. of the various cartilages (Figs. 312, 314). 4. Prepare the muscles in conformity with the indications furnished by a glance at Fig. 314. 5. Remove a larynx as carefully as possible, 80 as not to injure the walls of the pharynx, in order to study the interior of the organ, and especially its pharyngeal opening (Fig. 315). Form—Situation.—The larynx forms a veiy short canal, which gives admis' sion to the air during respiration, and is at the same time the organ of the voice. It is a cartilaginous box, flattened on each side, and open from one end to the other: the anterior orifice being situated at the bottom of the pharyngeal cavity, and the posterior continuous with the trachea. This apparatus, situated in the intra-maxillary space, is suspended between the two cornua of the os hyoides, and fixed to the extremities of these append- ages by one of its constituent pieces. It supports the pharynx, and by means of the walls of the latter is attached to the circumference of the posterior openings of the nasal cavities. In order to facilitate description, this brief notice of its form, situation, general relations, and mode of attachment will be followed by a notice of its structure; afterwards, the study of its external and internal surfaces will receive attention. Structuee of the Larynx.—It comprises in^its structure : 1. A cartila- ginous framework, composed of five pieces. 2. Muscles, which move these pieces. 3. A mucous membrane spread over the inner surface of the organ. 4. Vessels and nerves. 1. Cartilaginous fratneivorh of the larynx.—In this we find : three single median cartilages—the cricoid, thyroid, and epiglottis; and two lateral cartilages, the arytcenoid. All are movable, one upon the other. Cricoid Cartilage (Fig. 311, c). —This cartilage, as its name indicates (xptKos, cTSos, " hke a ring"), is exactly like a rin
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