A note on the elimination of polyneuronal innervation of skeletal muscles in neonatal rats

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Abstract
The elimination of the polyneuronal innervation was reinvestigated in normal rats from the tenth day after birth. The extent of polyneuronal innervation was measured by intracellular recordings in cut muscle fibre preparations (Barstad 1962). This preparation has the advantage that it favours the recording of small signals. With this increased sensitivity we detected a class of small end‐plate potentials which may represent nerve terminal function in the course of elimination. These small potentials were always observed in fibres with an additional large end‐plate potential and were occassionally present even in one‐month old rats.