CH. XVII. 



THE AUTONOMIC PATH 



199 



SPINAL 

 GANGLION 



V.M. 



FIG. 188. Diagram of the autonomic path in the spinal region. A.C.C. anterior cornual cell giving 

 rise to a large motor nerve-fibre which is distributed to voluntary muscle (V.M.). I.L.T. a 

 small cell of the intermedio-lateral tract giving rise to a small medullated nerve-fibre which 

 leaves the cord by an anterior root, and leaves the anterior root by the white ramus (W.R.) ; it 

 terminates by arborising around cells in a ganglion of the sympathetic chain. From these cells 

 fresh non-medullated axons continue the impulse, and return to the spinal nerve by the grey 

 ramus (G.R.) being finally distributed to involuntary muscular fibres (I.M.). The pre-ganglionic 

 path is coloured red, the post-ganglionic blue. To complete the diagram, a posterior root-fibre is 

 also shown with its parent cell in a spinal ganglion. 



LATERAL 

 SPINAL GANGLION 



Pre'-gangljonic fibre 



SOLAR 

 GANGLION 



Post-ganglionic fibres 



A. 



B. 



-._--' Pre-gang. fibre iVj '/ 



LATERAL 

 SPINAL GANGLION 



Pre/'-'ganglionic fibre 



PCS t-go ng /ionic fibre " ~ 



Flo 189. Arrangement of pre- and post-ganglionic fibres in splanchnic and inferior splanchnic 



nerves. (After Langley.) 



