The electrical phenomena accompanying the excitation of so-called secretory and trophic nerve fibres, in the salivary glands of the dog and cat / by J. Rose Bradford.

  • Bradford, John Rose, Sir, 1863-1935.
Date:
[1887?]
Catalogue details

Licence: Public Domain Mark

Credit: The electrical phenomena accompanying the excitation of so-called secretory and trophic nerve fibres, in the salivary glands of the dog and cat / by J. Rose Bradford. 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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    be not only more abundant, but also less viscid than normal, a diphasic vari- ation accompanies it, instead of one consisting of a second phase only. In the parotid of the dog similar phenomena, to these just described for the submaxillary of the same animal, are to be observed. Excitation of the sympathetic causes as a rule no actual secretion of parotid saliva, although it produces profound morphological changes in the gland cells. Occasionally however a slight secretion is obtained, as has been noticed by previous observers, particularly Langley1. This observer further noticed that it was only when an actual secretion was produced, that a clear outer zone was developed; this point is of importance with regard to the question, as to whether anabolic changes in the gland cells are accompanied by electrical variations. It will be seen from the following table, that when an actual secretion is produced on sympathetic excitation, the surface of the gland becomes negative to the hilus. Dog. Parotid. Chloroform and morphia. Curare. Time Nerve Electrical Variation Sign and. Amount Saliva C Strength oil Duration 12.30 tympanic plexus -120 3 drops 10 mm. 10 12.35 sympathetic + 40 none 50 mm. 10 12.40 tympanic plexus - 120 3 drops 10 mm. 10 12.41 tympanic plexus - 20 +20 - 60 1 drop 10 mm. 10 12.43 tympanic plexus - 10 +10 -70 1 drop 10 mm. 10 12.46 sympathetic — 60 after long latent period 1 drop 40 mm. 10 12.49 sympathetic — 70 after long latent period 1 drop 50 mm. 10 12.50 tympanic plexus - 120 2 drops 10 mm. 10 1 Langley. This Journal, Yol. vi. Page 71.