. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE BRONCHI. 541 Muscular layer.—Extended in a very thin continuous layer over the entire inner surface of the rings, this layer disappears in the smallest bronchial tubes. 3Iui'ous membrane.—This membrane is distinguished from that of the trachea by its great sensitiveness ; it alone constitutes the walls of the terminal bronchial divisions. (When the ^'g- 321. cartilages terminate, the tubes are wholly mem- branous, and the fibrous coat and longitudinal elastic fibres are continued into the ultimate ramifications of t
. The comparative anatomy of the domesticated animals. Veterinary anatomy. THE BRONCHI. 541 Muscular layer.—Extended in a very thin continuous layer over the entire inner surface of the rings, this layer disappears in the smallest bronchial tubes. 3Iui'ous membrane.—This membrane is distinguished from that of the trachea by its great sensitiveness ; it alone constitutes the walls of the terminal bronchial divisions. (When the ^'g- 321. cartilages terminate, the tubes are wholly mem- branous, and the fibrous coat and longitudinal elastic fibres are continued into the ultimate ramifications of the bronchi. The muscular coat is disposed in the form of a continuous layer of annular fibres, and may be traced upon the smallest tubes ; it is com- posed of the unstriped variety of muscular fibre.) Vessels and nerves.—The vessels and nerves dis- tributed in the tissue of the bronchial tubes, come from the satellite vessels and nerves of these tubes „,,„„,,„ , , , . , . ^ ^, MUCOUS MEMBRANE OF A BRON- —the bronchial arteries, veins, and nerves. The chial tube, with the oapil- lymphatics pass to the bronchial glands. laries injected. Differential Characters in the Air-tube succeeding the Nasal Cavities in the OTHER Animals. Ruminants.—In the Ox, Sheep, and Goat, the interior of the larynx is simpler than in the Horse, and the lateral ventricles and vocal cords are almost effaced. The most important differences in its various pieces are follows: 1. The thyroid cartilage has no anterior appendices, but is provided, posteriorly, with two considerable prolongations that articulate with the cricord cartilage (it has no excavation between the two wings, and is formed by a single piece : its inner face, in the middle, near the lower border, has a small fossette to which a round and very salient tuberosity on the external face corresponds). 2. The upper border of the cricoid is not notched in front (neither is the bezel on its lower border). 3. The epiglottis is
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