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FUNCTIONAL ASPECTS OF BRONCHIAL MUSCLE AND ELASTIC TISSUE
CHARLES C. MACKLIN, M.D., Ph.D., F.R.S.C.
Arch Surg. 1929;19(6):1212-1235.
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Few medical practitioners will be found who do not know that the bronchial tree contains smooth muscle, but probably not many realize that this muscle forms a motor organ extending uninterruptedly from the larynx to the outermost terminations of the air-carrying tubes, and infiltrating the entire lung substance. Indeed, on account of the thickness and uniformity of its distribution, one recent worker, Baltisberger,1 has averred that hardly a cubic millimeter of lung substance in the human being could be found which would not contain smooth muscle. There are reasons why the presence of this abundance of pulmonary muscle has not been observed earlier. One undoubtedly is the fact that in ordinary microscopic sections of the lung so much space is occupied by air that the tissues are spread apart, and the muscle elements, thus dispersed, do not bulk so large as they would if all the air could be
. . . [Full Text PDF of this Article]
Author Affiliations
LONDON, CANADA
From the Department of Anatomy of the Faculty of Medicine of the University of Western Ontario.
Footnotes
Credit for assistance in the preparation of this paper is gratefully acknowledged to the Marine Biological Laboratory, Woods Hole, Mass., where a work room and library facilities were placed at my disposal.
This article is mainly a synopsis of a monograph entitled "The Musculature of the Bronchi and Lungs" which appeared in Physiological Reviews, vol. 9, no. 1, January, 1929. This contains a full bibliography. For a more thorough treatment of the different subjects, the original should be consulted.
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