. The comparative anatomy of the domesticated animals. Veterinary anatomy. measure from 1-1600th to l-2250th of an inch in diameter, and from 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 which are united with the lining membrane to strength- en it, especially around the apertures of communication be- tween the adjoining air-cells.) r 3. Capillary vessels ramify- in the walls of the vesicles, and even project on their inner face. (The capillary plexuses are so arranged between t
. The comparative anatomy of the domesticated animals. Veterinary anatomy. measure from 1-1600th to l-2250th of an inch in diameter, and from 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 which are united with the lining membrane to strength- en it, especially around the apertures of communication be- tween the adjoining air-cells.) r 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 formiug 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.) Vescjels.—The lung is a very vascular organ. The nu- merous ramifications it receives divide into two v^rders—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 v o 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 orders of vessels, which necessarily participate in the physiolo- AIR-CELLS OP LUNG, WrTH I
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectveterinaryanatomy
