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On the branching of motoneurons

✍ Scribed by David L. Morgan; Uwe Proske

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
193 KB
Volume
24
Category
Article
ISSN
0148-639X

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✦ Synopsis

Innervation ratios were estimated for motor units supplying superficial lumbrical muscles of the cat after assigning units to one of three types, FF/FI, FR, and S, and estimating their axonal conduction velocity, based on published data. Similarly, unit tensions were converted to muscle fiber number using published values for specific tension and fiber cross-sectional area. A relation was established between axonal area of cross-section and number of fibers innervated which was matched reasonably well by a model of a branching motoneuron with preterminal diameter of 4.28 microm and a daughter-to-parent ratio of 1.48 at each level of branching. It is proposed that the main features of the model are likely to apply to all motoneurons.

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