The vaso-motor system / by Sir William M. Bayliss.

  • William Bayliss
Date:
1923
Catalogue details

Licence: In copyright

Credit: The vaso-motor system / by Sir William M. Bayliss. Source: Wellcome Collection.

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    situations, as Fig*. 7 shows. It seems to be a natural pro¬ perty of this kind of muscle. Further evidence of the existence of a natural “tone” in the arterial muscle is given by the results of Goltz and Freusberg (1874, p. 175). They divided the sciatic nerve in dogs and noticed that the temperature of the paralysed paw was at first higher than that of the normal one, owing to vascular dilatation whose cause will be discussed later. Figure 7. The retractor penis muscle of the dog. At the first signal, the muscle lengthens owing to stimulation of the pelvic nerve. At the second signal, the pudic nerve causes contraction. But after a few days, the temperature of the two paws became nearly equal and after some weeks that of the paralysed paw was sometimes lower than that of the nor¬ mal one, although the nerve supply had not been reesta¬ blished. This can only mean that the normal “tonus” had returned spontaneously. The existence in the sciatic nerve of fibres which cause dilatation of the vessels of the paw was shown by Goltz, Freusberg and Gergens (1876, p. 62). The dilatation which occurs on section of the nerve was enormously increased by snipping the nerve with scissors, a very effective means
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