214 STUDIES IN; ELECTRO-PHYSIOLOGY 



shunt-circuit, and would transform some portion of the 

 afferent impulse to an efferent one, should no other cell be 

 between it and the muscular fibre. The multipolar cell, ACC, 

 being interposed, it follows that one cell between the sensory 

 nerve and the muscular nerve-fibre is omitted in the diagram- 



" For a reflex action," remarks Halliburton, " three 

 things are necessary : (1) an afferent nerve, (2) a nerve- 

 centre consisting of nerve-cells to receive the afferent 

 impulse and send out the efferent impulse, and (3) an 

 efferent nerve along which the efferent impulse may 

 travel." Verb. sap. 



I have said that in my view unipolar cells are of the 

 storage type and appear to be prominently associated with 



Fig. 117. 



Shows on the left the motor nuclei and efferent fibres, except those of 

 the fourth nerve, and on the right side the afferent fibres. (After Sch&fer.) 



sensory nerve-fibres ; their function, mainly if not entirely, 

 being to maintain equilibrium in a closed-circuit system. 



In this connection there are at least two diagrams in 

 Schafer's Essentials of Histology which support my view* 



