Functional identification of interneurons responsible for left-right coordination of hindlimbs in mammals.

Abstract:

:Local neuronal networks that are responsible for walking are poorly characterized in mammals. Using an innovative approach to identify interneuron inputs onto motorneuron populations in a neonatal rodent spinal cord preparation, we have investigated the network responsible for left-right coordination of the hindlimbs. We demonstrate how commissural interneurons (CINs), whose axons traverse the midline to innervate contralateral neurons, are organized such that distinct flexor and extensor centers in the rostral lumbar spinal cord define activity in both flexor and extensor caudal motor pools. In addition, the nature of some connections are reconfigured on switching from rest to locomotion via a mechanism that might be associated with synaptic plasticity in the spinal cord. These results from identified pattern-generating interneurons demonstrate how interneuron populations create an effective network to underlie behavior in mammals.

journal_name

Neuron

journal_title

Neuron

authors

Butt SJ,Kiehn O

doi

10.1016/s0896-6273(03)00353-2

subject

Has Abstract

pub_date

2003-06-19 00:00:00

pages

953-63

issue

6

eissn

0896-6273

issn

1097-4199

pii

S0896627303003532

journal_volume

38

pub_type

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