Physiol Rev Journal of Neurophysiology
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Physiol. Rev. 80: 615-647, 2000;
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Physiological Reviews, Vol. 80, No. 2, April 2000, pp. 615-647
Copyright ©2000 by the American Physiological Society

Development of Specific Connectivity Between Premotor Neurons and Motoneurons in the Brain Stem and Spinal Cord

Joel C. Glover

Department of Anatomy, University of Oslo, Oslo, Norway

Glover, Joel C. Development of Specific Connectivity Between Premotor Neurons and Motoneurons in the Brain Stem and Spinal Cord. Physiol. Rev. 80: 615-647, 2000.Astounding progress has been made during the past decade in understanding the general principles governing the development of the nervous system. An area of prime physiological interest that is being elucidated is how the neural circuitry that governs movement is established. The concerted application of molecular biological, anatomical, and electrophysiological techniques to this problem is yielding gratifying insight into how motoneuron, interneuron, and sensory neuron identities are determined, how these different neuron types establish specific axonal projections, and how they recognize and synapse upon each other in patterns that enable the nervous system to exercise precise control over skeletal musculature. This review is an attempt to convey to the physiologist some of the exciting discoveries that have been made, within a context that is intended to link molecular mechanism to behavioral realization. The focus is restricted to the development of monosynaptic connections onto skeletal motoneurons. Principal topics include the inductive mechanisms that pattern the placement and differentiation of motoneurons, Ia sensory afferents, and premotor interneurons; the molecular guidance mechanisms that pattern the projection of premotor axons in the brain stem and spinal cord; and the precision with which initial synaptic connections onto motoneurons are established, with emphasis on the relative roles played by cellular recognition versus electrical activity. It is hoped that this review will provide a guide to understanding both the existing literature and the advances that await this rapidly developing topic.




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