154 



NERVOUS TISSUES 



of the spinal cord, which region lacks white rami communicantes) ; (4) 

 enteric, including the myenteric and submucous plexuses of the digestive 

 tube. Langley proposes also the term 'parasympathetic' to designate the 

 sacral and cranial autonomic fibers, since in many parts of the body they 

 overlap the distribution of the sympathetic proper. 



In the sympathetic (or autonomic) ganglia Dogiel (Anat. Anz., 1896) 

 likewise recognized two cell types, in general smaller than those of the 



FIG. 170. SYMPATHETIC NEURONS. 



A, in myenteric plexus, ileum of cat; B and C, in myenteric plexus, ileum of dog; 

 D, E, F, in submucous plexus, ileum of dog; a, axon. A corresponds to Dogiel' s 

 Type I, a motor neuron; B and C correspond to Dogiel's Type II, probably sensory 

 neurons. (After Kuntz, Jour. Comp. Neur., 23, 3, 1913.) 



spinal ganglia: (1) small multipolar fusiform or stellate nerve cells with 

 5 to 20 dendrons and an axon which enters the nerve trunks as a non- 

 medullated fiber, but may later acquire a thin medullary sheath motor 

 neurons; (2) larger spheroidal nerve cells with 1 to 16 dendrons and a 



