154 



LOCALIZED ELECTRIZATION. 

 G 



CH.NOBi D. 



IBAI\A:VD 



Fig. 41.— Vaso-motor nerves accompanying capillaries in the palatine iiiucous membrane of a frog 

 (alter (jlimbert).^ 



B. — Tonicity of the vascular constrictors augmented hy localized 

 electrization. — Experiments show that the great sympathetic is 

 highly excitable, at least in the cervical legion, and that its 

 excitability is quickly exhausted. Thus it has been mentioned 

 previously that, under the influence of even a feeble induced or 

 continuous current, a contraction of vessels is produced, presently 

 followed by a dilatation of some persistence. This dilatation of 

 vessels is with good reason held to depend upon a paralysed state 

 of the vaso-motor nerves, producing an afflux of blood to the 

 parts controlled by them, and an elevation of temperature, which 

 has hence been called neuro-paralytic hypenemia. 



But the kind of weakening of vascular tonicity, which is the first 

 effect of localized faradization, is only momentary, and is soon 

 followed by a reaction. Indeed, both clinical observation, and the 

 therapeutical results that have been obtained, tend to prove that. 



" C, C, Capillary vessels. N, vaso-motor 

 nerve. G, (r, G, ganglions forming ner- 

 vous branches at the level of the anasto- 



moses of the arterial capillaries. E, Iso- 

 lated fibre of Reraak, terminating in a 

 point. 



