A cholinesterase activity was revealed in two to four regions of each of the 120 fibers isolated from the frog sartorius muscle, which suggests polysynaptic character of innervation of the phasic muscle fibers. Electrophysiological methods showed the participation of different axons in formation of synapses with a single fiber, as well as the existence of synapses with the correlation between EPP's amplitude and strength of stimulation. The data obtained show such EPPs to be connected with polyaxonal innervation of one region of a muscle fiber.
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