Electrophysiological study of size and fibre distribution of motor units in the human masseter and temporal muscles

摘要: Probably related to their unique function, human jaw muscles have a specialized muscle-fibre composition different from that of limb and trunk muscles. In muscle healthy young adults, there were large groups densely-packed fibres the same histochemical type, finding which indicates re-innervation when seen in The number per motor unit, local distribution within units neuromuscular transmission masseter temporal examined by single-fibre EMG macro EMG. One hundred forty-seven low-threshold four subjects recorded. first dorsal interosseus hand was similarly measured. slightly smaller, than arm leg differed having significantly-higher fibre density, may be explained higher frequency small type-II causing closer packing type-I, units. concentration similar normal without any sign grouping unit. Normal end-plate another argument against re-innervation.