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PMID: 10024372 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Complete compensation in skilled reaching success with associated impairments in limb synergies, after dorsal column lesion in the rat.

McKenna JE, Whishaw IQ

Abstract

Each of the dorsal columns of the rat spinal cord conveys primary sensory information, by way of the medullary dorsal column nucleus, to the ventrobasal thalamus on the contralateral side; thus the dorsal columns are an important source of neural input to the sensorimotor cortex. Damage to the dorsal columns causes impairments in synergistic proximal or whole-body movements in cats and distal limb impairments in primates, particularly in multiarticulated finger movements and tactile foviation while handling objects, but the behavioral effects of afferent fiber lesions in the dorsal columns of rodents have not been described. Female Long-Evans rats were trained to reach with a forelimb for food pellets and subsequently received lesions of the dorsomedial spinal cord at the C2 level, ipsilateral to their preferred limb. Reaching success completely recovered within a few days of dorsal column lesion. Nevertheless, a detailed analysis of high-speed video recordings revealed that rotatory limb movements (aiming, pronation, supination, etc.) were irreversibly impaired. Compensation was achieved with whole-body and alternate limb movements. These results indicate the following: (1) in the absence of the dorsal columns, other sensorimotor pathways support endpoint success in reaching; (2) sensory input conveyed by the dorsal columns is important for both proximal and distal limb movements used for skilled reaching; and (3) detailed behavioral analyses in addition to endpoint measures are necessary to completely describe the effects of dorsal column lesions.

MeSH Terms
Animals Behavior, Animal/physiology Female Forelimb/physiology Movement/physiology Psychomotor Performance/physiology Rats Rats, Long-Evans Recovery of Function/physiology Spinal Cord/pathology,physiology Spinal Cord Injuries/physiopathology Video Recording
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
McKenna J E
Department of Psychology and Neuroscience, University of Lethbridge, Alberta, Canada, T1K 3M4.
Whishaw I Q
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Article Info
Journal
The Journal of neuroscience : the official journal of the Society for Neuroscience
Abbr.
J Neurosci
ISSN
0270-6474
Published
1999-03-01
Pages
1885-94
Language
English
Region
United States
NLM ID
8102140
PMCID
PMC6782168
Subset
IM
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