Abstract
ON the basis of anatomical studies, Deiters nucleus has been divided into parts projecting to different levels of the spinal cord, and it has been suggested that these parts are not functionally equivalent1. We have recently shown that those Deiters cells which project to the lumbosacral cord can be strongly facilitated by electrical stimulation of peripheral nerves; the polysynaptic pathway through which facilitation is produced does not traverse the cerebellum, and can be activated by stimulation of all types of afferents other than Group I fibres from muscle2. In the present experiments the effects of peripheral and labyrinthine inputs on Deiters cells that send axons to the lumbosacral cord have been compared with the effects of those inputs on Deiters cells that send axons to more rostral spinal segments. The results of this single unit physiological analysis have in many respects confirmed the interpretation of the organization of Deiters nucleus proposed by Brodal and his collaborators1.
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