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Axon collaterals ?

Mark Zarella zarellam at twcnyremove.rr.comspam
Sun Jan 4 19:15:27 EST 2004

> Thank you!  Sigh, more reading.
> For others following the discussion, the other incredible thing in the
> retina is that signalling is done by switching OFF the stream of
> transmitter coming from the rods and the cones.  So a detectable burst
> of light produces a temporary stop in the outflow of glutamate, and this
> pause in secretion is what we actually detect as the basis for visual
> stimuli!
> Show you how quickly the glial cells scavenge the glutamate from the
> cleft - and why vision is actually the slowest of the senses in terms of
> the briefest detectable stimulus.

And probably why the receptors are the most metabolically demanding.

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