. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE LUNGS 4G0 ) minute polygonal cells lining the air or pulmonary vesicles from 1-I600th to l-2250tli of an inch in diameter, and from Fig. (The measure l-2800th to l-3800th of an inch in thickness. Between the vesicles is a trabecular tissue, mainly composed of yellow elas- tic with a few muscular fibres, some of virhich are imited with the lining membrane to strength- en it, especially around the apertures of communication be- tween the adjoining air-cells.) 3. Capillary vessels ramify in the walls of the vesic
. The comparative anatomy of the domesticated animals. Veterinary anatomy. TEE LUNGS 4G0 ) minute polygonal cells lining the air or pulmonary vesicles from 1-I600th to l-2250tli of an inch in diameter, and from Fig. (The measure l-2800th to l-3800th of an inch in thickness. Between the vesicles is a trabecular tissue, mainly composed of yellow elas- tic with a few muscular fibres, some of virhich are imited with the lining membrane to strength- en it, especially around the apertures of communication be- tween the adjoining air-cells.) 3. Capillary vessels ramify in the walls of the vesicles, and even project on their inner face. (The capillary plexuses are so arranged between the two layers forming the walls of two adjacent cells, as to expose one of their surfaces to each, in order to secure the influence of the air upon them. These networks are so close, that the diameter of the meshes is scarcely so great as that of the capillaries which inclose them.) Vessels.—The lung is a very vascular organ. The nu- merous ramifications it receives divide into two orders—the functional and the nutritive vessels. Functional vessels of the lung.—We know that the blood returns from all parts of the body by the veins, after losing, along with its bright red ' '^' colour, the properties which render it fit to maintain the vitality of the tissues. It thus arrives at the right side of the heart, whence it is pro- pelled into the lung, there to be regenerated by mediate contact with the air. It is the pulmonary artery which conveys this fluid into the parenchyma of the organ, and by the pulmonary veins it is carried back to the heart. The artery is at first divided into two branches, which ramify and finally terminate in dense capillary plexuses upon the walls of the air-cells. The veins, innumerable and attenuated at their origin, like the arterial capillaries, terminate in from four to eight principal trunks, which open into the left auricle of the heart. These two orde
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