46 



EXPERIMENTAL PHYSIOLOGY 



Dendrites. 



process 



Neurilemma 



XXVIII. NERVOUS TISSUE (OPTIONAL). 



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

 compound microscope. 



Directions. A. The* Nerve 

 Cell. Note the irregular out- 

 line of the cell; the wavy pro- 

 jections, or dendrites; the rod- 

 ]fa e 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 Fiber. Make 

 out from your study of the 

 nerve fiber, the axis cylinder 

 in the center. (This corre- 

 sponds to the nerve process of 

 A.) Next outside this is the 

 medullary sheath, and on the 

 very outside the neurilemma. 

 Make a drawing showing all 

 these parts. For their relation 



FIG. 21 Scheme of a Neuron: a, pnTnnj , Tp 

 free axis cylinder; 6, axis cylinder ( 

 surrounded by neurilemma alone; 

 c, axis cylinder surrounded by 

 medullary sheath alone ; d, axis 

 cylinder surrounded by the sheath be placed in One OI the aDOVC 



tisSU6S of the body Can 



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 ip such a preparation, 



the nodes of Ranvier). 



