Physical diagnosis, including diseases of the thoracic and abdominal organs : a manual for students and physicians .. . e axillary space by folding the arms across thechest, with the tips of the fingers resting on oppositeshoulders. Or, when sitting, the arms may hang looselybetween the knees, allowing the shoulders to drop for-ward as much as possible. These positions uncover alarge portion of the thorax, and the line of the scapulacorresponds to the lower border of the upper lobe andinterlobular septum. CONDITIONS MODIFYING PERCUSSION SOUND. As the object of percussion is to elicit sound fro
Physical diagnosis, including diseases of the thoracic and abdominal organs : a manual for students and physicians .. . e axillary space by folding the arms across thechest, with the tips of the fingers resting on oppositeshoulders. Or, when sitting, the arms may hang looselybetween the knees, allowing the shoulders to drop for-ward as much as possible. These positions uncover alarge portion of the thorax, and the line of the scapulacorresponds to the lower border of the upper lobe andinterlobular septum. CONDITIONS MODIFYING PERCUSSION SOUND. As the object of percussion is to elicit sound from thedeeper portion of the thoracic cavity it is necessary toconsider the influences that the different structures haveupon the vibrations that are set up. (1) Influence of the Soft Parts.—The ease with whichthe soft parts are thrown into vibration depends largely PERCUSSION. 85 upon their structure. Muscular tissue, on account of itstension, is easilv influenced, so that with the bonv thoraxchiefly covered with muscle, vibrations are readily con-veyed to the deeper portions of the chest. Over that part Fig. 1, 2 and 3 represent the difference of result of percussion notes ofequal strength, but with different body thicknesses. 3 and 4 show how,by increasing the force of the blow, lung resonance is obtained. 86 THE RESPIRATORY SYSTEM. of the thorax where the muscle tissue is heavy, blows thatwould be sufficient to set up vibrations in the air-contain-ing spaces below the thinly covered portion are absorbedby the heavy muscle and no sound is heard. Adipose tissue, on account of its lack of elasticity, isthrown into vibration with difficulty, while oedematoustissue is the most difficult of all to influence by ordinarypercussion. The effect that the soft parts have uponvibration is clearly shown in Fig. 26. In order to overcome this interference of the softparts with the transmission of vibration, it is necessarythat the percussion be more forcible, as shown in Fig. 26. It i
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