. L'anatomie comparée des animaux domestiques. Anatomie vétérinaire. TBACBEA tSE. Formulaire 461.-Les bronches ne sont pas aplati comme la trachée ; une section transversale montre à être régulièrement cylindrique. Volume.-La bronche gauche est toujours plus petit que le droit, et les deux sont bien inférieures en volume à l'ensemble de leurs branches respectives. Belations.-'Ei&ah. bronches entre dans le lobe pulmonaire ainsi que les vaisseaux sanguins, qui avec elle forme ce qui est appelé la racine du poumon. Les divisions de ce tronc arborescentes sont accompagnés par l'artère bronchique, d'idées, et du système nerveux

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. The comparative anatomy of the domesticated animals. Veterinary anatomy. tSE TBACBEA. 461 form.—The bronchial tubes are not flattened like the trachea; a transverse section shows them to be regularly cylindrical. Volume.—The left bronchus is always smaller than the right, and both are much inferior in volume to the aggregate of their respective branches. Belations.—'Ei&ah. bronchus enters the pulmonary lobe along with the blood-vessels, which with it forms what is called the root of the lung. The divisions of this arborescent trunk are accompanied by the bronchial artery, vein, and nerves, which ramify in the same manner. Near their origin, the bronchi are related to the bronchial glands, above which, and to the left side, passes the oesophagus. Steuottjre.—The structure of the bronchial tubes resembles that of the trachea ; their walls being formed by a cartilaginous framework, a muscular layer, mucous membrane, and vessels and nerves. Cartilages of the hroncM.—These only exist in tubes of a certain calibre, the minute passages being deprived of them, and having only membranous walls. As in the trachea, this framework includes, for each tube, a series of transverse rings joined border to border; though these are no longer formed of a single arciform piece, but each results from the union of several lozenge-shaped pieces whose extremities overlap, and which are united to each other, like the cartilaginous segments of the neighbouring rings, by means of cellular layers, and also by the membranes spread over their internal surface. Muscular layer.—Extended in a very thin continuous layer over the entire inner 'surface of the cartilaginous rings, this layer disappears in the smallest bronchial tubes. Mucous membrane.—This membrane is dis- Fig 233 tinguished from that of the trachea by its great sensibility; it alone constitutes the walls of the terminal bronchial divisions. (Wben the cartilages terminate, the tubes are wholly mem- branous, and the f

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