THORACIC WHITE RAMUS COMMUNICANS IN MAN 81 
in figure 5 we show a camera-lucida sketch (cross-section) of a 
first thoracic white ramus communicans which is typical of our 
series. In the subject from which this section was taken, two 
well-defined rami ran from the first thoracic nerve to the first 
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Fig. 5 Transverse section of a first thoracic white ramus communicans. 
This ramus ran from the first thoracic spinal nerve to the first thoracic sympa- 
thetic ganglion. It was removed and fixed in osmic acid two hours after death. 
Note the separate fasicle of large medullated fibers at the upper margin of the 
drawing. Camera sketch. X 227. 
thoracic ganglion. The latter was connected with the inferior 
cervical ganglion by a short constricted portion of sympathetic 
trunk which could hardly be considered an internodal segment. 
The two rami were of unequal size, the smaller white ramus 
measuring approximately 0.6 mm. in diameter, and the gray 
ramus about 1.5 mm. The gray ramus was composed almost 
