Index of the Fascicular Plexus Complexity in Peripheral Nerves

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  • 神経束叢の複雑さはどのように表わされるか

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In the human peripheral nervous system, nerves are usually composed of many fasciculi, which are bundles of nerve fibers invested by the perineurium. They divide and unite repeatedly to form a fascicular plexus along the full length of the nerve. The biological significance of these remains unknown, and there is no index to compare the complexity of the plexus among different parts of a nerve, different nerves and different species. Therefore, we worked out an index showing the complexity of the fascicular plexus and named it the fascicular plexus index (FPI). The FPI was defined as 2(D+U)/(N1+N2), where D and U denote the frequency of division and union of fasciculi within a piece of nerve that is 1 cm in length, respectively. N1 and N2 denote the number offasciculi at both ends of the range. With the use of the index, it is possible to examine quantitatively the intraneural structure of peripheral nerves.

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