[Modulation of the activity of muscle afferents during stimulation of the motor and premotor cortex in the cat].
Local stimulation of hind leg motor representation area within the cat postcruciate cortex (area 4) changed the afferent activity of muscle spindles in hindpad flexor muscles. The early cessation of background activity correlated with extrafusal muscle fibres contraction. After return of the muscle to initial length, a significant increase of afferent discharge was observed followed by recovery to the initial level. Stimulation of contra- and ipsilateral parts of precruciate cortex (area 6) evoked selective long-lasting facilitation with aftereffect without involving extrafusal muscle fibres. Similar changes, however less pronounced occurred in secondary endings. The independent action of areas 6 and 4 on muscle spindle activity indicates a specific role of area 6 in regulation of segmentary activity of the gamma-system.
D000818:Animals; D001931:Brain Mapping; D002415:Cats; D004558:Electric Stimulation; D005625:Frontal Lobe / Q000502:physiology*; D009044:Motor Cortex / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology; D009047:Motor Neurons, Gamma / Q000502:physiology; D009119:Muscle Contraction; D009470:Muscle Spindles / Q000502:physiology*
Moduliatsiia aktivnosti myshechnykh afferentov pri stimuliatsii motornoĭ i premotornoĭ kory mozga koshki.