Abstract
Neuromuscular junction morphology itself is the result of a developmental process that probably is going on during the whole life span of an animal. This process is based on several mechanisms: those that require neural activity and those that do not, see Goodman and Shatz [13] for a recent review). In general the initial steps of axonal guidance and target recognition can occur before neurons become functionally active and so, diffusible gradients and extracellular matrix molecules play a significant role [27,30,31,34,35]. As development progresses and synaptic terminals display adult characteristics, miniature endplate potential frequency and endplate potential quantal content increase gradually achieving their adult values in rat [9] and amphibian muscle fibers [5]. So, thereafter neural activity-related mechanisms can induce plastic modifications tending to remodelate circuits and terminate the molecular organization of the connections [21,32,33,40,41]. This process of activity-dependent synaptic plasticity does not stop at birth but seems to continue throughout the lifetime of the organisms. In the adult neuromuscular junctions there are many situations indicating that synapse or muscle cell activity-depending mechanisms govern plasticity, growth responses and the final size that can be attained by motor nerve endings in a particular situation [3,43,52]. For instance, the activity-dependent seasonal remodelling changes in frog neuromuscular junctions [50].
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Fenoll-Brunet, M.R., Tomas, J., Santafé, M., Lanuza, M.A. (1996). Neuromuscular Remodelling in the Adult Induced by Small Physiologic Changes in the Locomotor Activity. In: Ghista, D.N. (eds) Biomedical and Life Physics. Vieweg+Teubner Verlag. https://doi.org/10.1007/978-3-322-85017-1_53
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