NERVE 



197 



termed pre-ganglionic fibres ; after their interruption post- 

 ganglionic. 



3. The various fibres, after their interruption, proceed, 



Fig. 99.— Scheme of Distribution of the Thoracico-Abdominal (the true 

 sympathetic) and the Cranial and Sacral (the para-sympathetic) 

 Splanchnic Nerves. 



generally as non-medullated or grey fibres, to their termina- 

 tion. Here they form synapses with the network of fibres 

 and cells which constitute the terminal plexuses. Upon 

 these, in the gut at least, the control of the tissues is largely 

 devolved. 



