Activity of thoracic and lumbar epaxial extensors during postural responses in the cat

Experimental Brain Research
J M Macpherson, Joyce Fung

Abstract

This study examined the role of trunk extensor muscles in the thoracic and lumbar regions during postural adjustments in the freely standing cat. The epaxial extensor muscles participate in the rapid postural responses evoked by horizontal translation of the support surface. The muscles segregate into two regional groups separated by a short transition zone, according to the spatial pattern of the electromyographic (EMG) responses. The upper thoracic muscles (T5-9) respond best to posteriorly directed translations, whereas the lumbar muscles (T13 to L7) respond best to anterior translations. The transition group muscles (T10-12) respond to almost all translations. Muscles group according to vertebral level rather than muscle species. The upper thoracic muscles change little in their response with changes in stance distance (fore-hindpaw separation) and may act to stabilize the intervertebral angles of the thoracic curvature. Activity in the lumbar muscles increases along with upward rotation of the pelvis (iliac crest) as stance distance decreases. Lumbar muscles appear to stabilize the pelvis with respect to the lumbar vertebrae (L7-sacral joint). The transition zone muscles display a change in spatial tuning with stance dista...Continue Reading

Citations

Feb 9, 2007·Journal of Neurophysiology·Simon F GiszterVirginia Graziani
May 15, 2010·The Journal of Veterinary Medical Science·Yasuhiro WadaNaomi Wada
Apr 24, 2007·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Richard Preuss, Joyce Fung
Jun 23, 2007·Journal of Neuroengineering and Rehabilitation·Nicoleta Bugnariu, Joyce Fung
Jan 12, 2007·Journal of Neurophysiology·Sergiy YakovenkoArthur Prochazka
Dec 22, 1999·Journal of Neurophysiology·J Fung, J M Macpherson
Feb 13, 2001·Journal of Neurophysiology·S M HenryF B Horak
Dec 22, 1999·Journal of Neurophysiology·J M Macpherson, J Fung

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