Muscle spindle afferent input to motoneurons in human masseter.
The H-reflex response in large and small single motor units in human deep anterior masseter was studied to investigate the distribution of muscle spindle afferents onto masseter motoneurons. We found that only the larger units displayed H-reflex responses. This indicates preferential distribution of muscle spindle input onto large motoneurons or a skewed distribution of tonic presynaptic inhibitory mechanisms.
Department of Physiology, University of Adelaide, Adelaide, South Australia 5005, Australia.
S D
SD
Scutter
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KS
Türker
D000328:Adult; D000344:Afferent Pathways / Q000502:physiology; D004558:Electric Stimulation; D004576:Electromyography; D005260:Female; D006181:H-Reflex / Q000502:physiology*; D006801:Humans; D008297:Male; D008406:Masseter Muscle / Q000294:innervation*; D009046:Motor Neurons / Q000502:physiology*; D017729:Presynaptic Terminals / Q000502:physiology