NERVE-TISSUE. 



II 



become more homogeneous in structure, until at their ex- 

 tremity they are reduced to a filament in which the walls, the 



Fig. 6. Nervous tissue seen under the microscope. 



a. b, SpJierical nerve-cells. 



c, Bi-polar cell. 

 />, Multi-polar cells. 



h, Cells of the ganglia and nen>e-jib*'es. 



i, Nerve-tube and axis-cylinder. 



k, Termination of a nerve-fibre in an organ. 



cylindrical axis, and medullary substance are not distinguish- 

 able At certain points of the nervous system the tubes 

 differ anatomically, according as they belong to the nerves 

 of sensation or the nerves of motion. 



Other elements also are found in the nervous tissue (he 

 ganglionic cells or corpuscles* and the fibres of Remak. 



The ganglionic corpuscles , so called because they are found 

 in the substance of the ganglia, receive the sensitive tubes 

 as they come from the brain or spinal marrow. These tubes 

 unite with the walls of the corpuscle at one of the points 

 or poles of its periphery, and emerge from it at the opposite 

 pole. 



