File:Hand-book of physiology (1892) (14578801307).jpg

Identifier: handbookofphysio00bake (find matches)
Title: Hand-book of physiology
Year: 1892 (1890s)
Authors: Baker, W. Morrant, (William Morrant), 1839-1896 Harris, Vincent Dormer Kirkes, William Senhouse, 1823-1864. Hand-book of physiology. 13th ed
Subjects: Physiology Human physiology
Publisher: London : John Murray
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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ced by the movements of the chest are com-municated to a recording tambour. This apparatus is a simplified form ofMareys pneumograph (fig. 214). The variations of intrapleural pressure may be recorded by the intro-duction of a cannula into the pleural or pericardial cavity, which is con-nected with a mercurial manometer. CH. VII.) RHYTHM OF RESPIRATION. 275 Finally, it has been found possible in various ways to record the dia-phragmatic movements by the insertion of an elastic bag connected with atambour into the abdomen below it (phrenograph.), by the insertion ofneedles into different parts of its structure, or by recording the contractionof isolated strips of the diaphragm. The acts of expansion and contraction of the chest take upunder ordinary circumstances a nearly equal time. The act ofinspiring air, however, especially in women and children, is a littleshorter than that of expelling it, and there is commonly a veryslight pause between the end of expiration and the beginning of
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M 1 I n I l 1 1 1 11 1 1 i n 1 11 m n mi 1 1 1 1 ■■ Fig. 216.—Tracing of the normal diaphragm respirations of rabbit, a, with quick move-ment of drum, b, with slow movement, j, inspiration, e, expiration. To be readfrom left to right. (Marckwald.) the next inspiration. The respiratory rhythm may be thus InspirationExpiration A very slight paust. 67 or 8 If the ear be placed in contact with the wall of the chest, or beseparated from it only by a good conductor of sound or stetho-scope, a faint respiratory murmur is heard during inspiration.This sound varies somewhat in different parts—being loudest orcoarsest in the neighbourhood of the trachea and large bronchi(tracheal and bronchial breathing), and fading off into a faint T 2 276 EESPIEATION. (CH. vil. sighing as the ear is placed at a distance from these (vesicularbreathing). It is best heard in children, and in them a faintmurmur is heard in expiration also. The cause of the vesicular,murmur has received various explanation

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