Abstract
Stimulation in the lateral reticular nucleus (LRN) antidromically activates neurones with cell bodies in C3–C4 which project to lower cervical segments. These neurones belong to the C3–C4 propriospinal system and are assumed to mediate disynaptic excitation from higher motor centres to forelimb motoneurones. Short latency EPSPs evoked in forelimb motoneurones by stimulation in the LRN are interpreted as being monosynaptically mediated via the bifurcating axons of the C3–C4 neurones. Stimulation in the LRN also evokes monosynaptic IPSPs in these C3–C4 neurones, possibly by antidromic activation of inhibitory neurones with a collateral projection to the propriospinal neurones. The collateral from the C3–C4 neurones to the LRN are assumed to provide the cerebellum with information of the activity reaching the forelimb motoneurones from the C3–C4 propriospinal system and to allow a feedback control of the activity in this system.
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