Hi Cameron:

    Sympathetics release epinephrine/norepinephrine, parasympathetics 
release acetylcholine. I don't know if there are any parasympathetics 
directly innervating heart muscle, most (at least the ones that I know 
of) innervate the SA and AV nodes to slow the heart rate.

Geoff

Cameron Hogan wrote:

>    I am trying to see parasympathetic and sympathetic innervation in cardiac tissue.  What is the best way to distinguish each?  Thanks for help!
>
>Cameron
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Geoff McAuliffe, Ph.D.
Neuroscience and Cell Biology
Robert Wood Johnson Medical School
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mcauliff@umdnj.edu
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