ON REFLEXES IN THE SYMPATHETIC SYSTEM 221 



foot in five; and Ihe heart JDeat and blood pressure in one only. In no case 

 was there any trace of effect on stimulating the cervical sympathetic. The 

 resnltlthink shows that the nerve-cells of the superior cervical ganglion 

 send no nerve fibres to the pilo-motor, to the vaso-motor, or to the sudo- 

 riparous nerve-cells of the ganglion stellatum, and give good ground for 

 believing that they send no nerve fibres at ail to the ganglion stellatum. 

 Further, I think the resuit shows that the fibres of the cervical sympathetic 

 which traverse the ganglion stellatum send no branches to its cells. 



Connection of the inferior cervical ganglion with the ganglion stellatum. 



— If the inferior cervical ganglion sends nerve fibres to the ganglion stella. 

 tum, thèse must pass to it by the annulus of Vieussens. Each limb of the 

 annulus was tied or eut a little below the inferior cervical ganglion. The 

 first three thoracic rami were eut, the thoracic sympathetic was tied and 

 eut just above the fourth thoracic white ramus, and the nervus longus colli 

 was also eut. 



Stimulation of the thoracic sympathetic a little below the ganglion 

 stellatum caused as usual érection of hair over the lower cervical and upper 

 thoracic vertebrœ, pallor and sécrétion of the pads of the fore foot. None 

 of thèse effects were produced by stimulating the central ends of the annulus 

 of Yieussens. I conclude Ihen that the nerve-cells of the inferior cervical 

 gauglion send no fibres to the pilo-motor, vaso-motor and sudoriparous 

 nerve-cells of the ganglion stellatum. And further that the afférent fibres 



— which arc numerous in the annulus — hâve no direct connection with 

 the ganglion stellatum. 



Stimulation of the central end of the accelerator nerve. — The nerve 

 commonly called the accelerator, arises as is well known, direct from the 

 ganglion stellatum, sometimesrunning separately, sometimes accompanying 

 for a short distance the central limb of the annulus of Vieussens. It con- 

 tains many sensory fibres. Many of its motor fibres are post-ganglionic, 

 but whether they ail are is not known. I hâve experimented with this as 

 with the annulus of Vieussens. Stimulation of its central end bas no effect 

 upon the liairs in the région governed by the ganglion stellatum, nor so far 

 as I hâve observed has it any affect upon the several glands or blood vessels 

 of the fore foot, but on the latter structures, I hâve only made a few experi- 

 ments. Hence I conclude that nervous impulses cannot pass by the [post- 

 ganglionic and by the sensory fibres of the accelerator nerve to the pilo- 

 motor nerve-cells of the ganglion stellatum, and probably not to the other 

 classes of nerve-cells, in the ganglion. 



Stimulation of the central end of one limb of the annulus of Vieussens, 

 the other being intact. — According to François Franck (1) a number of 



(1) Arch. de Physiol. norm. etpath., 1894, p. 717. 



