Lung
an organ of respiration.
Human Anatomy. The organs of respiration are on each side of the chest, conical, and separated from each other by the heart in front and a membranous partition, the mediastinum. Externally they are convex, to correspond with the chest walls, and internally concave to in a tapering cone and below in a broad receive the heart; above they terminate concavity resting on the diaphragm. In color they are mottled, pinkish-gray, speckled with black. Each is divided into two lobes, separated by a deep fissure, and the right lung has a third lobe above of triangular shape; the right is also larger on account of the heart lying toward the left side. The lungs are kept in position by their roots, composed of the bronchi, pulmonary artery, and pulmonary veins; the right side presents the bronchus above, then the artery, then the veins; but on the left side we find the bronchus between the artery and the veins. Each lung is inclosed in a serous membrane, the pleura, which extends to its root, and is then expanded on the chest wall. The lungs are composed of minute ramifications of the bronchial tubes, terminating in intercellular passages and quadrilateral or hexaggonal air-cells, along with ramifications of the pulmonary artery and veins, bronchial arteries and veins, lymphatics and areolo-fibrous tissue constituting the nerves, the whole bound together by parenchyma of the lungs. See PHYSIwork presenting a salient angle to OLOGY: RESPIRATION. ward the enemy, and flanks open at the gorge. Optics: A perifocal spectacleglass; concavo-convex, its curve approximating the shape of the eye and affording more distinct oblique vision. Ordnance, a forked iron plate into which the stock of a field-gun carriage is inserted.
LUNÉVILLE (lü-nā-vēl'), a town in the French department of Meurthe-et- Comparative Anatomy. - In the lowest and simplest forms of animal life (aquatic), we find no trace of respiratory organs, the interchange between the layer of water with the aerating surface being effected by the general movement of the body, or by cilia. In most of the Mollusca we find gills in the place of lungs, except in the terrestrial species, as the snail or slug, where we LUNGCHOW LUSITANIA Scorpio. It contains no stars larger than the third magnitude.