Reflex activation patterns in relation to multidirectional ankle torque in decerebrate cats

Cutaneous reflexes have been described primarily according to their actions in the flexion/extension plane. It is shown here, by measuring electromyography and isometric force in decerebrate cats, that ankle muscles are activated in relation to their actions in the abduction/adduction plane during s...

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Bibliographic Details
Published in:Motor control 1999-04, Vol.3 (2), p.135-150
Main Authors: Siegel, S G, Nichols, T R, Cope, T C
Format: Article
Language:English
Subjects:
Animals
Ankle
Cats
Culture Techniques
Decerebrate State
Electromyography
Muscle, Skeletal - innervation
Reflex - physiology
Skin Physiological Phenomena
Tarsus, Animal - physiology
Torque
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Summary:Cutaneous reflexes have been described primarily according to their actions in the flexion/extension plane. It is shown here, by measuring electromyography and isometric force in decerebrate cats, that ankle muscles are activated in relation to their actions in the abduction/adduction plane during sural nerve (SNR) and crossed-extension (XER) reflexes. Ankle adductors (tibialis posterior, extensor digitorum longus, and flexors digitorum and hallucis longus) were active in XER, but not in SNR. Muscles producing ankle abduction (medial and lateral gastrocnemii and peroneus longus and brevis) were consistently more strongly activated in SNR than in XER. This differential pattern of muscle activation results in greater abduction torque at the ankle in SNR than in XER. These data demonstrate reflex organization in relation to the multidirectional torque generated by individual muscles.
ISSN:1087-1640
1543-2696
DOI:10.1123/mcj.3.2.135