. A practical treatise on medical diagnosis for students and physicians . ) dulness. Modifications of these typesrepresent all sounds produced under every variety of circumstances. Resonance. The term resonance, or pulmonary resonance, is appliedto the clear sound that is produced by percussion over the lungs, due tothe vibration of the chest-walls and of the air in the bronchi. Fig. 90. Relative Dulnessof Heart. Absolute Dulnessof Heart Splenic Tympany Showing the areas of resonance, dulness, and tympany in health. Dulness. Dulness indicates the absence of air. The sound over
. A practical treatise on medical diagnosis for students and physicians . ) dulness. Modifications of these typesrepresent all sounds produced under every variety of circumstances. Resonance. The term resonance, or pulmonary resonance, is appliedto the clear sound that is produced by percussion over the lungs, due tothe vibration of the chest-walls and of the air in the bronchi. Fig. 90. Relative Dulnessof Heart. Absolute Dulnessof Heart Splenic Tympany Showing the areas of resonance, dulness, and tympany in health. Dulness. Dulness indicates the absence of air. The sound over theheart is dull, and may be compared with dull sounds yielded over areasusually resonant. Absolute dulness implies that the part underneath inimmediate contact with the surface of the chest is airless. Relative dul- PERCUSSION OF THE HEALTHY LUNGS AND PLEURM. 387 ness implies the interposition of an air-containing structure between anairless structure and the chest-wall. The portion of the heart or liver incontact with the chest-wall yields absolute dulness when percussed ; thatportion overlapped by lung yields relative dulness. Absolute dulness isreadily elicited, and all observers will usually obtain the same area ofabsolute cardiac dulness. Relative dulness, however, depends so muchupon the method of percussion, whether light or strong, and upon theexaminers ear, that its extent will be determined dif
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