Further evidence of incomplete neural control of muscle properties in cat tibialis anterior motor units

The activity of succinate dehydrogenase (SDH) and muscle fiber cross-sectional area (CSA) of cat tibialis exhibit a better correlation with myosin heavy chain (MHC) phenotype than with the motor unit type, suggesting the extent of influence of motoneurons on properties of muscle fibers in self-reinnervated muscles. Conversion of the different fibers of the various units to a single homogenic entity does not take place.