NERVOUS TISSUE 



nuclei. The protoplasm is often pigmented. Around the cell bodies, 

 nuclei of the sheath cells may be abundant. Three types of sympathetic 

 ganglion cells are shown in Fig. 137. The motor cells, terminating in 

 contact with smooth muscle fibers, are by far the most abundant (Fig. 

 137, i). Their neuraxons are non-medullated fibers, which are provided 

 with very slender collaterals. The cell body is stellate and its branching 

 dendrites appear spiny. The second type (Fig. 137, 2) is possibly sensory, 



Motor fiber from a spinal nerve. 

 \ 

 Pericellular plexus 



Capsule 



Neuraxons 



Sympathetic 

 nerve. 



Sensory fiber from a 

 spinal nerve. 



Sympathetic (?) 

 nerve fiber. 



Section of the 



pericapsular 



plexus. 



Surface view 



of pericapsular 



plexus. 



Stellate cell. 



Neuraxon. 



Smooth . \ . . 



muscle fibers ' ^ 



Lamellar corpuscle 



FIG. 137. DIAGRAM OF THB ELEMENTS OF Two SYMPATHETIC GANGLIA. 



but the terminations of its fibers are not known. Its dendrites are long 

 and slender and may extend from one ganglion to another. Some of them 

 are accompanied by the neuraxon, which may acquire a medullary sheath, 

 often at a considerable distance from the cell body. Cells of the third 

 type (Fig. 137, 3) resemble those of the second type. They have long 

 branching dendrites which pass between the adjacent cells to the periphery 

 of the ganglion, where they form a plexus. Their non-medullated neurax- 



