[Vibrissal inputs into the motor cortex of adult and developing rats].
Field potentials (FP) and responses of single neurones to electrical stimulation of vibrissal pads have been recorded in motor cortex in the albino mature and developing rats. The FPs were characterized by 3-phasic shape and high stability in mature rats. The FPs evoked by contralateral stimuli have a range of onset latency of 4 to 24 ms (peak of distribution 8-11 ms); those to ipsilateral stimuli have a latency of 4 to 23 ms (peak of distribution 12-16 ms). Responses of single neurones were evoked with a latency of 9 to 20 ms. Usually, the FPs were evoked by both contralateral and ipsilateral stimulation, and in some tracks were effective only ipsilateral stimuli in the developing rats beginning from the 11th day of life. The FPs in such animals were less stable and more fatigable. During 2-4 weeks of life, FPs evoked by contralateral stimulation appeared with a latency of 15 to 46 ms; during the same period, a latency of single unit responses ranged between 20 to 33 ms. The FPs to ipsilateral stimuli appeared with a latency of 18 to 47 ms, a latency of single unit responses of 27 to 47 ms. The results indicate functional immaturity of vibrissal system up to the end of the first month of rat life.
Golikova
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D000344:Afferent Pathways / Q000502:physiology; D000375:Aging / Q000502:physiology*; D000818:Animals; D004558:Electric Stimulation; D008564:Membrane Potentials / Q000502:physiology; D009044:Motor Cortex / Q000502:physiology*; D009474:Neurons / Q000502:physiology; D051381:Rats; D014738:Vibrissae / Q000294:innervation / Q000502:physiology*
Vibrissnye vkhody v motornuiu koru u vzroslykh i razvivaiushchikhsia krys.