The respiratory function of the human larynx : from experimental studies in the Physiological Laboratory of Harvard University / by Franklin H. Hooper.

  • Hooper, F. H. (Franklin Henry), 1850-1892
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: The respiratory function of the human larynx : from experimental studies in the Physiological Laboratory of Harvard University / by Franklin H. Hooper. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    deep inspiration as long as the stimulation was kept up. On ceasing the irritation the respiratory movements went on as before. The right vocal hand was in no way influ- enced when the left recurrent was stimulated with an inten- sity not exceeding 10. When, however, a more powerful stimulation (15) was employed, the right vocal hand was brought to the median line (phonatory position), w hile at the same time the left hand was pulled outw ard. We have, then, here a double effect: adduction of the vocal baud on the healthy siile, and oAduetiou on the side where some alteration had taken place in the nerve tila-rs; or, in other words, the normal action of constriction of the right side was manifested while the left hand was oidocted, owing to the degeneration of the phonatory fiber*, the respiratory filaments remaining unharmed ; and, consequently, the respi- ratory muscle alone responded to the stimulation. The right vocal ham! wa- now paraly red by section of the right pueumogawtric. the hand coming to a standstill in the cadav- eric position, or the position w« are accustomed to see in eases of “ recurrent pmlyuK. Stimulation applied to the right recurrent resulted in a smart closure of the glottis, effected by the right vocal hand being brought forcibly against its fellow, as well as by the contraction of the ary- ta'iioida us fcran«ver*u*. which approximated the two arvte- noid cartilages. It could not he accurate] v determineii whether the anterior portion of the left banal contracted or not, as even a feeble irritation produced such a rapid and complete closure of the laryngeal aperture. If the closure of the left vocal hand was brought into action, it was >erv slight ; it was evident that the closure of the glottis wa* chiefly effected by the contraction of the constrictors on the right side, and by the arytjenoida-us transversus muscle. Hie electrode was again changed to the left recurrent below the insertion of the thread. Stimulation was followed by 4
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