Identifier: manualofhumanphy01land (find matches)
Title: A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine
Year: 1885 (1880s)
Authors: Landois, L. (Leonard), 1837-1902 Stirling, William, 1851-1932
Subjects: Physiology Histology
Publisher: Philadelphia, P. Blakiston, Son, and Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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e pulmonary arteryaccompany the bronchi and are closely applied to them. (As they proceed theybranch, but the branches do not anastomose, and ultimately they terminate insmall arterioles which supply several adjacent alveoli, each arteriole splitting up intocapillaries for several air-cells (Fig. 99, v, c). An efferent vein usually arises at theopposite side of the air-cells and carries away the purified blood from the capillaries.In their course these veins unite to form the pulmonary veins which are joined intheir course by a few small bronchial veins (Zuckerkandl). The veins usuallyanastomose in the earlier part of their course, whilst the corresponding arteries donot.) Although the capillary plexus is very fine and dense, its sectional areais less than the sectional area of the systemic capillaries, so that the blood-streamin the pulmonary capillaries must be more rapid than that in the capillaries of thebody generally. The pulmonary veins, unlike veins generally, are collectively
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Fig. 99. .Semi-schematic representation of the air vesicles of the lung—v, v, blood-vesselsat the margins of an alveolus ; e, c. its blood capillaries ; E, relation of thesquamous epithelium of an alveolus to the capillaries in its wall; f, alveolarepithelium shown alone ; f, e, elastic tissue of the lung. narrower than the pulmonary artery (water is given off in the lung), and they haveno valves. (The pulmonary artery contains venous blood, and the pulmonary veinspure or arterial blood). (B) The BRONCHIAL VESSELS represent the nutrient system of the lungs. They(1-3) arise from the aorta (or intercostal arteries) and accompany the bronchiwithout anastomosing with the branches of the pulmonary artery. In theircourse they give branches to the lymphatic glands at the hilum of the lung, THE PLEUP.A AND THE LYMPHATICS OF THE LUNG. 223 to the walls of the large blood-vessels (vasa vasorum), the pulmonary pleura,the bronchial walls, and the interlobular septa. The blood which issues fromth

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