File:Anatomy, descriptive and surgical (1887) (14762865041).jpg

Identifier: anatomydescripti1887gray (find matches)
Title: Anatomy, descriptive and surgical
Year: 1887 (1880s)
Authors: Gray, Henry, 1825-1861 Pick, T. Pickering (Thomas Pickering), 1841-1919, ed Keen, William W. (William Williams), b. 1837
Subjects: Human anatomy Anatomy
Publisher: Philadelphia : Lea brothers & co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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nary veins arise; coalescing into large branches, theyaccompany the arteries, and return the blood, purified by its passage through thecapillaries, to the left auricle of the heart. In the lung the branches of the pulmo-nary artery are usually above and in front of a bronchial tube, the vein below. The Pulmonary Capillaries form plexuses which lie immediately beneath the mu-cous membrane, in the walls and septa of the air-cells, and of the intercellular passages.In the septa between the air-cells the capillary network forms a single layer. The cap-illaries form a very minute network (Fig. 60, p. 81), the meshes of which are smallerthan the vessels themselves ;3 their walls are also exceedingly thin. The vessels of 1 Medico-Chirurgical Transactions, vol. xxviii., 1845. 2 The Anatomy of the Human Lung, 1860, pp. 136-150. 3 The meshes are only 0.002/// to 0.008//r in width, while the vessels are 0.003 to 0.005 (K61-liker, Human Microscopic Anatomy). 938 ORGANS OF VOICE AND RESPIRATION. i
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Fig. 620.—The Roots of the Lungs and Posterior Pulmonary Plexus, seen from behind. THYROID GLAND. 939 neighboring lobules are distinct from each other, and do not anastomose; and, accord-ing to Dr. Waters, those of the separate groups of intercellular passages, or air-sacs(which groups he denominates lobulettes), are also independent; so that in the septabetween two adjoining lobulettes there would be a double layer of capillaries, onelayer belonging to each of the adjacent air-sacs or intercellular passages. If thisis really the arrangement of the vessels, it would follow that in the septa betweenthe air-cells (or alveoli) the blood in the capillaries would be exposed on all sides tothe action of the air, since it is circulating in a single layer of vessels, which is incontact with the membrane of the air-passages on both sides, but that in the septabetween the intercellular passages (or air-sacs) the blood in the double layer of cap-illaries will be in contact with the air on one

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