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Science 10 August 1973:
Vol. 181. no. 4099, pp. 559 - 561
DOI: 10.1126/science.181.4099.559
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Articles

Hyperinnervation of Skeletal Muscle Fibers: Dependence on Muscle Activity

Jan K. S. Jansen 1, Terje Lømo 2, Kåre Nicolaysen 2, and Rolf H. Westgaard 2

1 Department of Physiology, University of Oslo, Oslo, Norway
2 Department of Neurophysiology, University of Oslo

After the motor nerve to the rat soleus muscle was blocked reversibly by local anesthesia, individual muscle fibers became innervated by a transplanted motor nerve without losing their original innervation. Such cross-innervation of the denervated soleus muscle by the same foreign nerve was largely reduced by direct electrical stimulation of the muscle. The results demonstrate the importance of muscle activity for synapse formation by a foreign motor nerve.


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