Last-order interneurones controlling activity of elbow flexor motoneurones during forelimb fictive locomotion in the cat.
Activity of C5-C7 last-order interneurones, which were identified by antidromic invasion from the elbow flexor motor nuclei, was examined during fictive locomotion. Three groups of neurones were found: one showing no rhythmic modulation of activity (non-modulated neurones), another rhythmically active mainly in phase with the target motoneurones (modulated neurones of group 1), the other out of phase with them (modulated neurones of group 2). Activity pattern suggested group 1 and group 2 neurones distributing excitation and inhibition to flexor motoneurones, respectively. Location of neurones seemed to be differentiated as well, group 1 located dorsally, group 2 ventrally in the gray matter.
Terakado
Y
Y
Institute of Basic Medical Sciences, Tsukuba University, Ibaraki, Japan.
Yamaguchi
T
T
D000818:Animals; D002415:Cats; D003655:Decerebrate State / Q000503:physiopathology; D004558:Electric Stimulation; D005071:Evoked Potentials / Q000502:physiology; D005552:Forelimb / Q000502:physiology; D007395:Interneurons / Q000502:physiology*; D008124:Locomotion / Q000502:physiology; D009046:Motor Neurons / Q000502:physiology*; D013116:Spinal Cord / Q000166:cytology / Q000502:physiology*