Why does a lizard's severed tail continue to twitch?

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Offline savio marel oliver

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Once when i was startled by a lizard ,a common pesky thingy and as usual its tail separated from its body and started wriggling .

 So i was wondering how could this tail be wriggling and that to in a kind of rhythmic manner, as its connection to its  brain was lost . so this again led to me thinking about how the headless chicken , during  butchering  moved about ?

To make it simple ,how can both lower forms and higher forms of animals body parts can move even when not connected to its 'brain'   ? [???]
as its muscles still need an impulse to stimulate it !  [?]
« Last Edit: 18/07/2009 08:11:13 by chris »


Offline RD

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Re: Why does a lizard's severed tail continue to twitch?
« Reply #1 on: 17/07/2009 22:09:24 »
Nerves in the spinal cord are responsible for the twitching ... 

In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain.