A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine (1885) (14801275373)

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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are the beating in the epigastrium, as inhypertrophy of the right or left ventricle, caused, it may be, by deep insertion ofthe diaphragm, and it may be partly by the beating of a dilated abdominal aorta orcoeliac axis. Abnormal dilatations (aneurisms) of the arteries cause an abnormal pulsation,while theyproducea slowing inthe velocity of the pulse-wave in the corresponding artery.Hence the pulse appears later in such an artery than in the artery on the healthyside. Hypertrophy and dilatation of the left ventricle cause the arteries near theheart to pulsate strongly. In the analogous condition of the right ventricle, the beatof the pulmonary artery may be seen and felt in the second left intercostal space. 80. Vibrations communicated to the Body by the action of the Heart, The beating of the heart and large arteries communicates vibrations to the bodyas a whole, but the vibration is not simple but compound. Gordon was the first to represent this pulsatory vibration graphically. If a
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B /LL K 1 n Fig. 70. II, Elastic support for registering the molar motions of the body—K, a woodenbox ; B, feet of patient; p, cardiograph ; a, b, elastic tubing. I, III—Vibra-tion curves of a healthy person. IV—Similar curve obtained from a patientsuffering from insufficiency of the aortic valves and great hypertrophy of theheart. 158 VIBRATIONS COMMUNICATED TO THE BODY BY THE HEART. person be placed in an erect attitude in the scale of a large balance, the indexoscillates, and its movements coincide with the hearts movements. Fig. 70, I, shows a curve obtained by Gordon, written directly by the index ofthe spring balance. The lowest part of the curve corresponds to the systole of theventricle. Landois employed the following arrangement:—Take a long four-sided box, K,open at the top, and arrange several coils, a, b, of stout caoutchouc tubing roundone end. A wooden board, B, smaller than the opening in the box, is so placedthat it rests with one end on the caoutchouc tubing,