INJURY POTENTIALS ALONG PERIPHERAL NERVES IN RELATION TO HISTOLOGICAL STRUCTURE

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Abstract
The injury potentials at different levels of peripheral nerves in the cat''s lumbo-sacral region have been measured. They diminished continuously from the spinal nerve roots towards the periphery. The proportion between the injury potentials of the ventral roots and the tibial nerve was 4:1. Ventral roots had on an avg. 4.7 mV higher injury potentials than dorsal roots. This drop of the injury potential along the nerve was related to the calibre of the nerve fibers at the different levels. A general correlation was observed between cross-sectional fiber area/total nerve cross-sectional area and injury potential so that a greater relative fiber cross-sectional area corresponded to a higher injury potential. Calibre spectra are presented for a number of nerves at different levels as well as for motor and sensory roots (cat).