On a new method of recording the motions of the soft palate / By Harrison Allen.

  • Allen, Harrison, 1841-1897.
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: On a new method of recording the motions of the soft palate / By Harrison Allen. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    which represents the descent of the palate, and begins at the point at which the curved line ends and terminates at the horizontal line; and, third, the horizontal line itself, which represents the record made by the end of the rod when at rest upon the surface of the moving cylinder. It is evident that the number of the notch-like depressions will answer to as many acts of elevation as are recorded at a single trial. The differences in the depressions will be the differences in the acts of elevation themselves. The degree of elevation and the abruptness of the fall are constant, but the length of the curve will depend upon the time taken by the palate to reach its highest elevation and the time it is sustained in that position before it falls to the position of rest.^ The tracing of the motion of the palate in the first act of deglutition is found to vary slightly from the above when the act of swallowing is completed (Fig. 3). This difference is expressed in the tracing Fig. 3. 11 ill! i _^ ■ ^ ! ' ' ' ' ■■? ■■ ■■! ■' liiiliB iiiiil ■^V,-' -''' ~~^Vy'i J:xG. 3. —The ti-acuii • of the act of deglutition. in a shorter curve of elevation, and a very gradual instead of a precipitous descent. The tracings of the acts of exhaling,^ of cough- ing, of hawking, and of sniffing will be found to be ' All tracings are to read from left to right. 2 By exhaling is meant the sound without voice which is made by sud- denly depressine the palate from a moderately elevated position (the mouth being closed), and by driving the air out through the nostrils. It is a sound habitual with some persons who suffer from catarrh.