PLASTICITY OF MOTONEURONE RECRUITMENT ORDER IN THE FLEXION REFLEX FOLLOWING SPINAL CORD TRANSECTION

摘要: The observation that motoneurones are generally activated in order (small recruited before large) is known as ‘the size principle’ of motoneurone recruitment (Henneman, 1977). While a number exceptions to this principle have been noted, there abundant evidence it does hold for variety inputs wide range animals (Henneman & Mendell, 1981). Interestingly, the cutaneous evoked flexion reflex first report orderly (Olson, Carpenter Henneman, 1968) received little additional experimental study or verification. In one few other studies dealing with during was reported motor unit can be variable, despite application standardised stimuli spinal man (Grimby Hannerz, 1970). present experiments results activation tibialis anterior nerve fibres by stimulation saphenous and superficial peroneal nerves acute three month chronic cats support Olson et al. (1968). However, significant deviations from standard were found these reflexes two week animals.