Last-order interneurones controlling activity of elbow extensor motoneurones during forelimb fictive locomotion in the cat.
Last-order interneurones, which were identified by antidromic invasion from the elbow extensor motor nuclei (triceps brachii), were examined for rhythmic activity during fictive locomotion. Last-order neurones with activity modulated were divided into 3 groups: one exhibited flexor-like activity, another extensor-like, and the third activity which had properties of both. Flexor-like neurones, presumably inhibitory, were located in the rostral segments (C6-C7), whereas extensor-like ones, presumably excitatory, were located in the caudal (C7-T1). Neurones of the third group were found in the most caudal segments (C8-T1). The results seem to suggest the existence of functional localization in the stepping generator.
Ichikawa
Y
Y
Institute of Basic Medical Sciences, Tsukuba University, Ibaraki, Japan.
Terakado
Y
Y
Yamaguchi
T
T
D000818:Animals; D002415:Cats; D003655:Decerebrate State; D004558:Electric Stimulation; D005552:Forelimb / Q000294:innervation* / Q000502:physiology; D007395:Interneurons / Q000502:physiology*; D008124:Locomotion / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology*; D013116:Spinal Cord / Q000166:cytology / Q000254:growth & development