A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . cles(Williams, 1835). This sound is supported and increased by the sound produced by thetension and vibration of the auriculo-ventricular valves and theirchordre tendiniae, at the moment of the ventricular systole (Rouanet,Kiwisch, Bayer, Giese). Wintrich, by means of proper resonators, has been able so to analysethe first sound as to distinguish the clear, short, valvular part from thedeep, long, muscular sound. The muscle-sound produced by transverse
A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . cles(Williams, 1835). This sound is supported and increased by the sound produced by thetension and vibration of the auriculo-ventricular valves and theirchordre tendiniae, at the moment of the ventricular systole (Rouanet,Kiwisch, Bayer, Giese). Wintrich, by means of proper resonators, has been able so to analysethe first sound as to distinguish the clear, short, valvular part from thedeep, long, muscular sound. The muscle-sound produced by transversely-striped muscle does not occur with asimple contraction, but only when several contractions are superposed to producetetanus (see Muscle). The ventricular contraction is only a simple contraction,but it lasts considerably longer than the contraction of other muscles, and hereinlies the cause of the occurrence of the muscle-sound during the ventricular con-traction. Defective Heart-Sounds.—In certain conditions (typhus, fatty degenerationof the heart) where the muscular substance of the heart is much weakened, the THE HEART-SOUNDS. 93. Fig. 31. The heart—its several parts arid great vessels in relation to the front of thethorax. The lungs are collapsed to their normal extent, as after death,exposing the heart. The outlines of the several parts of the heart are indi-cated by very fine dotted lines. The area of propagation of valvular murmursis marked out by more visible dotted lines. A, the circle of mitral murmur,corresponds to the left apex. The broad and somewhat diffused area, roughlytriangular, is the region of tricuspid murmurs, and corresponds generally withthe right ventricle, where it is least covered by lung. The letter C is in itscentre. The circumscribed circular area, D, is the part over which the puluionicarterial murmurs are commonly heard loudest. In many cases it is an inch,or even more, lower down, corresponding to the conus arteriosus of the rightventricl
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
