Bauhaus-Universität Weimar

Titel:
Experimental Researches on the Tension of the Vocal Bands [A paper read at the Fifth Annual Congress of the AMERICAN LARYNGOLOGICAL ASSOCIATION, May 23, 1883. Issued as a supplement to the ARCHIVES OF LARYNGOLOGY, July, 1883, Offprint]
Person:
Hooper, F. H.
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39621/5/
TENSION OF THE VOCAL BANDS. 
5 
ward or downward movement of the thyroid, however, can 
be observed. The respirations are somewhat shortened 
during the stimulation, but the recording pen attached to 
the thyroid cartilage remains on the same level throughout 
the experiment. The next experiment, performed after the 
dog had been killed by section of the medulla oblongata, 
yields the same result. 
Tig Z 
Thyroid 
25>...... » 
Cricoid. 
DOG ; MEDULLA DESTROYED. 
In this figure (2) it will be noted that, respiration having 
•ceased, the pens trace a straight line. 'As in the previous 
experiment (fig. 1), stimulation of the nerves caused the 
same rise of the cricoid, while no appreciable effect was pro¬ 
duced on the thyroid. The minute elevations in the thyroid 
line, at the points of irritation, were probably accidental, as 
will be explained hereafter. The following experiment was 
performed on a different animal, but under similar condi¬ 
tions as the preceding. 
Here (fig. 3) the same effects as in the foregoing experi¬ 
ments are evident, only more pronounced, the rise of the 
cricoid being very powerful. The undulations in the thyroid 
line will be readily understood when we consider what an in¬ 
finitely small amount of movement of the cartilage would be
        

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