Abstract
Summary
A separate small-nerve motor system to frog skeletal muscles is described. It is active reflexly and may be related to muscle tone. It evokes local potentials and local shortening at the region around the nerve-muscle junctions, in sharp contrast to the propagated twitches and muscle impulses which can be elicited, by the usual motor nerves in the same muscle fibres. Small fibre activity alone may set up appreciable muscle tension.
I wish to thank Dr. R. W. Gerard for his stimulating interest and help and also Mr. L. Boyarsky for much assistance.
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