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/lit39621/15/
TENSION OF THE VOCAL BANDS. IS- 
This movement may be readily observed by taking am 
excised human larynx or that of one of the lower animals, 
dog or cat, and arranging it in this manner. Suspend the 
larynx to an ordinary iron holder by a clamp attached to the 
hyoid bone. Plug the glottis with cotton-wool and plaster. 
Inflation of the trachea causes the front part of the cricoid 
cartilage to rise on to the thyroid. Easy as it is to demon¬ 
strate this phenomenon, we meet with a difficult problem in 
proceeding to explain the cause of it. It seems fair to infer 
that from the anatomical construction of the larynx the 
ascent of the cricoid must be an active, and the descent a 
passive movement. For when the parts are at rest physio¬ 
logically, the attachment of the cricoid to the trachea 
and the strength of the thyro-cricoid ligament would, 
prevent any downward movement of the cricoid cartilage 
per se ; if any such movement did take place, it would have 
to be shared also by the thyroid cartilage and the trachea. 
It was at first thought that the trachea itself, stretched and 
expanded by inflation, would push the cricoid upward, and 
thus approximate it to the thyroid. But we were compelled 
to abandon this view, as it was found that, after cutting the 
trachea off close to the cricoid, leaving only enough (two 
rings) to attach the canula, the phenomenon took place as 
before. 
It was then suggested that the force arising from the 
communication of motion of the current of air passing from 
the trachea into the laryngeal cavity might communicate its 
onward motion to the cricoid, and thus raise it on to the 
thyroid. The non-resisting and elastic crico-thyroid mem¬ 
brane offering no obstacle to such a movement of the cricoid 
cartilage, while the ascent of the thyroid would be checked 
by the resistance arising from the approximation of the 
bands inside, and the influence of the extrinsic muscles out¬ 
side. Not being thoroughly satisfied, however, that this 
explanation solved the problem, we surmised that the ex¬ 
pansion of the larynx itself, when inflated, might play an 
important part in producing the phenomenon. 
The construction of the larynx is so complicated, it is 
not at first sight clear why such a movement as we have-
        

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