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descending inhibition of stretch reflexes

Bjoern Brembs bjoern at brembs.net
Wed Apr 21 12:22:11 EST 1999

Richard Hill wrote:

> If the ankle flexor reflex is initated and measured (using an
> electromyogram and electrodes on the calf muscle )while a subject
> clenches their hands togther and attempts to pull them apart,
> (Jendrassick Manouvre)
> the amplitude of the electrical activity recorded is reduced,
> compared to that which occurs when the subject is at rest, this must be
> due to the descending spinal cords, but what componts of the relex arc
> to they influence to cause this effect

I'm not sure about the reflex in question, but for a discussion of
modifications of another reflex arc by descending input from the spinal
cord see:

Wolpaw, J.R. (1997): The complex structure of a simple memory. TINS 10:


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