NORMAL HISTOLOGY. 



79 



CHAPTER X. 

 NERVOUS TISSUES AND SYSTEMS. 



1. NERVOUS TISSUE. 



Nervous tissue is derived from the epiderm of the embryo and en- 

 ters into the structure of the central, sympathetic and terminal sys- 

 tems, and is, therefore, very widely distributed. The following out- 

 line exhibits something of the more common characteristics of 

 nervous tissue : 



OUTLINE OF NERVOUS TISSUE. 



Cells 



Ganglia 



Fibres 



Structure . . 



Kinds . 



Processes. . . 



Cells. 



Fibres. 



Sheath. 



Medullated. 



Non-medul- 

 lated i 



Nucleus. 

 Protoplasm. 



Neuroblast. 



Neuron. 



Neuro-dendron. 



Unipolar. 



Bipolar. 



Multipolar. 



First-type. 



Second-type. 



Neuroglia-cell or glia-cell. 



Axis cylinder. 



Collaterals. 



Dendrites. 



' Structure 



Nerve endings , 



( Neurilemma. 

 Medullary sheath. 

 Axilemma. 

 Axis cylinder. 

 Fibrils. 



Nodes of Ranvier. 

 Internodes. 

 Nerve corpuscle. 



Central. 

 Peripheral. 



Nodes and internodes. 



Nerve corpuscle and Neurilemma. 



