NERVOUS CONTROL OF INSECT MUSCLES 97 



brief, local, spike responses. In some fibers there is an overshoot of the 

 zero base line. 



(6) The "slow" fiber innervates only a proportion of the muscle fibers, 

 sharing end plates with the "fast" fiber. Neuromuscular transmission is 

 effected by end-plate potentials of various magnitudes showing consid- 

 erable facilitation and summation. 



(7) In the execution of natural movements there occur combinations 

 of long trains of "slow"-fiber activity with occasional bursts of "fast"-fiber 

 activity. 



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