IUBio

Muscle rigidity in cats with severed spinal cords

ray johnstone ray at iinet.com.au
Tue Nov 24 21:28:32 EST 1998


eladyt at tx.technion.ac.il wrote:

>Hello,
>
>  I have been told that when the spinal cord of a cat is cut, the muscles
>controlled by the cut nerves become rigid. This suggests that motor commands
>to muscle "tell" the muscle how much to relax, and not how much to contract.
>
>   Could anyone point me to a reference about this phenomena (in cats or
>possibly in humans) ?
It is called decerebrate rigidity and is due to a loss of descending
inhibitory pathways. It does occur in humans. You can read about it in
any textbook of physiology. 
J.R.Johnstone (Ray Johnstone)
ray at iinet.com.au
www.iinet.com.au/~ray



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