Diseases of the chest and the principles of physical diagnosis . hboringsolid organs upon those filled with air. Such a dulling influence does notexist (Sahli). The strength of percussion must vary with the size andcharacter of the organs and neighboring tissues: , in children (thinchest walls, superficial organs) light percussion is necessary; in corpulentadults (thick chest walls, deeply placed organs) heavier percussion isrequired. 1 Moritz and Rihl: Deul. Arch. f. kl. Med., 1909. METHODS AND RESULTS OF PERCUSSION 85 As has been stated, the percussion note obtained over the lung is acom
Diseases of the chest and the principles of physical diagnosis . hboringsolid organs upon those filled with air. Such a dulling influence does notexist (Sahli). The strength of percussion must vary with the size andcharacter of the organs and neighboring tissues: , in children (thinchest walls, superficial organs) light percussion is necessary; in corpulentadults (thick chest walls, deeply placed organs) heavier percussion isrequired. 1 Moritz and Rihl: Deul. Arch. f. kl. Med., 1909. METHODS AND RESULTS OF PERCUSSION 85 As has been stated, the percussion note obtained over the lung is acompound sound, consisting of the note of the pleximeter, the chest wall,and lung. In heavy percussion it is the lower, and in Hght percussionthe higher, range of this complex to which our chief acoustic attention isdirected. Both have the higher range—the pleximeter note—in com-mon, but there is relatively more of the pleximeter note in the soundproduced by light percussion. Lessening of the amount of pulmonaryair is manifested by a lack of the deeper Fio. 76.—8ection through the upper part of the thorax, viewed trum below. The lineof section is not exactly horizontal, a slightly lower plane being reached on the right sidethan on the left. In order to show the apical parietal pleura, the pulmonary apices havebeen removed. There can be noted in this specimen the beginning contact of the rightpleura with the trachea, and the anterior position of the innominate artery, whose bifurca-tion is well shown. On the left side, the wide separation of the pleura from the trachea bymeans of the large arteries, esophagus, and areolar tissue can readily be seen. The deepposition of origin and the obliquely anterior course of the left subclavian artery is plainlyvisible. T, trachea; E, esophagus; , right apical pleura; , left apical pleura;, innominate artery, dividing into , right subclavian artery and , rightcommon carotid artery; , left subclavi
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