46 



EXPERIMENTAL PHYSIOLOGY 



Cell 



body 



Dendrites. 



Nerve process 



XXVIII. NERVOUS TISSUE (OPTIONAL). 



Apparatus. Prepared slides of ganglion cells and nerve fibers, * 

 compound microscope. 



Directions. A. The* Nerve 

 Cell. Note the irregular out- 



line f the Cel1 ;* th ^ Wavy pro- 



jections, or dendrites; the rod- 

 j^ projections, or nerve proc- 

 esses. Note the position of the 

 nucleus. Has the cell one or 

 Axis cylinder more nerve processes? Draw 

 and locate all parts, under the 



high power. 



B. The Nerve 

 out from your 

 nerve fiber, the 

 in the center. 



sponds to the nerve process of 

 A.) Next outside this is the 

 medullary sheathj and on the 

 very outside the neurilemma. 

 Make a drawing showing all 

 these parts. For their relation 



FIG. 21. Scheme of a Neuron: a, .,1 -r-v O1 



free axis cylinder; 6, axis cylinder Compare With Fig. 21. 



Neurilemma 



Fiber. Make 



study of the 



axis cylinder 



(This corre- 



Terminal 

 branches 



All tissues of the body can 



surrounded by neurilemma alone ; 

 c, axis cylinder surrounded by 

 medullary sheath alone ; d, axis 

 cylinder surrounded by the sheath be placed in One of the above 



^ classes-epithelial, connective, 

 muscular, or nervous. 



*A smear preparation of spinal cord may be prepared as follows: Rub a 

 piece of fresh spinal cord in water between two cover glasses. Mount and 

 run under the cover glass a drop of methyl green. Both nerve fibers and 

 nerve cells appear in such a preparation 



the nodes of Ranvier). 



