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1. The events taking place during the elimination of polyneuronal innervation in the soleus muscle of new-born rats have been studied using a combination of electrophysiological and anatomical techniques. 2. Each immature muscle fibre is supplied by two or more motor axons which converge on to a single end-plate. There was no sign of electrical coupling(More)
The present work aims to distinguish between processes that lead to neonatal synapse elimination. We have partially denervated the mouse soleus muscle just after birth by cutting one (L5) of the two (L4 and L5) spinal nerves which supply its innervation. After 4-6 weeks' survival times, we determined the number of remaining motor units (MUs) and the number(More)
(1) The perinatal reorganization of muscle innervation is executed in a setting established by the earlier embryonic developmental processes. Prominent among these is the generation of a stereotyped set of skeletal muscles, each innervated in an orderly fashion from an appropriate pool of spinal motoneurons. The muscles contain functionally specialized(More)
We have used recently developed fluorescein- and rhodamine-conjugated dextran-amines as axonal tracers in in vitro preparations of the nervous system of the chicken embryo. These substances are efficiently taken up by injured axons and transported rapidly to the cell bodies. They are also, albeit to a lesser degree, taken up by intact nerve terminals in(More)
The ultrastructure of neuromuscular junctions of rat soleus muscles 1-40 days postnatally was examined for possible morphological correlates of the transient polyneuronal innervation which is present in newborn rats. Several vesicle-laden profiles of terminal axons are seen to contact each muscle fiber up to 8 days postnatally. Axon terminals often lie(More)