SYMPATHETIC GANGLIA. 113 



and sometimes having two nuclei, and of fibers some of which merely 

 traverse the ganglia. The cells are enveloped in nucleated sheaths. They 

 include three types of multipolar cells shown in Fig. 138. Most of the 

 cells are of rounded oval form, often flattened, having stellate spiny 

 dendrites and a non-medullated neuraxon with very slender collateral 



Motor, Sensory spinal 



nerve fiber. 



Pericellular plexus 



Capsule 



Neuraxons. 



Sympathetic 

 nerve. 



View in section 



of pericapsular 



plexus. 



Surface view 



of pericapsular 



plexus. 



Stellate cell. 



Smooth 

 muscle fibers. 



Neuraxon. 



FIG. 138. DIAGRAM OF THE ELEMENTS OF Two SYMPATHETIC GANGLIA, BASED UPON 

 METHYLENE BLUE PREPARATIONS. 



branches (i). These are motor cells, and their neuraxons terminate in 

 contact with smooth muscle cells. The second type (2), possibly sensory, 

 includes rounded polygonal cells with slender dendrites which extend in 

 the sympathetic nerves even to the neighboring ganglia. Their neuraxons 

 may acquire myelin sheaths at some distance from the cell body or may 

 remain non-medullated. They pass to other ganglia but their termination 



