Cervical interneurones oligosynaptically excited from primary afferents and rhythmically active during forelimb fictive locomotion in the cat.
In C6-C7, activity of neurones oligosynaptically excited from primary afferents was examined during fictive locomotion. Two kinds of neurones were found: neurones with activity modulated and with activity not modulated. The minimum linkage of the pathway to modulated neurones was mono- and disynaptic from muscle and cutaneous afferents, respectively, while non-modulated neurones were monosynaptically excited from both afferents. Modulated neurones were mainly located in the ventral part of the dorsal horn and adjoining intermediate region, non-modulated ones located in the dorsal horn. Modulated neurones were found near motor nuclei as well. Active periods of modulated neurones were widely distributed in the step cycle.
Hishinuma
M
M
Institute of Basic Medical Sciences, Tsukuba University, Ibaraki, Japan.
Yamaguchi
T
T
D000344:Afferent Pathways / Q000502:physiology*; D000818:Animals; D002415:Cats; D003655:Decerebrate State / Q000503:physiopathology; D004558:Electric Stimulation; D005552:Forelimb / Q000294:innervation; D007395:Interneurons / Q000502:physiology*; D008124:Locomotion / Q000502:physiology; D013116:Spinal Cord / Q000166:cytology / Q000502:physiology*; D013569:Synapses / Q000502:physiology*