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

  • Harrison Allen
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.

    39/48 (page 31)
    can be i-eadily demonstrated. The length of time at which the palate remains elevated, and the duration of the time of ascent and descent, can also be easily Fig. 47 1 2 ], 2, 3 8, 9, 10 8 9 10 The curves of one, two, thi-ee, eight, nine, ten. ascertained. The palate is seen to be raised once only for some words ; twice for others, and three times for others. The numbers of these motions are invariable within a narrow range of individual varia- tion. The size of the curves, however, is not fixed owing to the difficulty of always reaching precisely the same spot of the broad upper surface of the soft palate. Bat the curves, whether deep or shallow, hold the same proportions one to another, as is seen in the diflPerent series of Fig. 6, and in the various curves of the letter I in Fig. 16, and of the letter s in Fig 17. By proper care in freeing the rod from contact with the salpingo-palatal fold, and in placing the rod about the centre of the palate, the exaggera- tion of curve can be in great measure prevented. It is evident that variation in the size of the bulb at the pharyngeal end of the rod will cause corresponding variations in the size of the curves. Hence it is re- commended to preserve the form and size of the bulb described on p. 167, and to keep it free from mucus. Even if the same spot could at all times be reached, would it be reasonable to expect the curves to have