Bauhaus-Universität Weimar

Titel:
Plethysmographic Experiments on the Vaso-Motor Nerves of the Limbs [From the Journal of Physiology, Vol. VII, Nos. 5 & 6, Offprint]
Person:
Bowditch, H. P. J. W. Warren
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39635/31/
PLETHYSMOQRAPHIC EXPERIMENTS. 
445 
contraction, while the same stimulation applied to the opposite, nerve cut 
four days previously causes a marked dilatation. 
Since experiments made in this way are more conclusive than those 
in which the fresh and degenerated nerves are studied on different animals, 
the following table is given, showing the effect produced by stimulations 
of medium strength and slow or moderate rate applied to nerves which 
had been divided three and four days previously, a comparison being 
made between the degenerated nerves and the fresh nerves in the same 
set of experiments, 
Table Y. 
Stimulation of medium strength. 
Bate. 
Nerve divided. 
0 days 
3 days 
0 days 
4 days 
i _4 
TXF + 
in 1" 
Number of observations 
Average contraction 
Average dilatation 
26 
2-7 
31 
19 
1-3 
3-3 
10 
4-5 
1-7 
9 
0-0 
3-4 
5—16 
in 1" 
.Number of observations 
Average contraction 
Average dilatation 
32 
8-8 
2-2 
32 
3-6 
5-3 
19 
6-3 
1-3 
19 
0-0 
6-8 
The figures of this table have been used for the construction of the 
curves in fig. 21 a, which show very clearly the change in the character 
of the vaso-motor phenomena produced by the degeneration of the 
nerve. 
Fia. 21a. 
Days after nerve section. 
0 3 0 4 
B = 5—16. 
It thus appears that, as a nerve degenerates after section it loses its 
constricting earlier than its dilating power, or in other words the vaso-
        

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