Abstract
1) Histological studies showed that the lateral-line organ of fish is innervated by a number of thin and thick nerve fibers. Each thick fiber, ramifying repeatedly, innervates several cells in the central part of the organ. Each thin fiber branches into many more and are connected to many peripheral cells.2) The electro-physiological, combined with histological, studies of the lateralline sense organ strongly suggests a peripheral neural mechanism of higher sensory organs, that is:A single end organ is supplied by many thin and thick fibers, among which the thinner fibers are probably related to the threshold, that is, to the perception of stimuli, while the thicker fibers to its discrimination.
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