Can anyone recommend a good resource (free or paid) for finding detailed images of the nervous systems of various animals?

In particular I am looking for images of the peripheral nervous system of cephalopods such as Octopi or Squids. Ideally I'd prefer images made via some form of medical imaging with radioactive dye, but I will settle for medical illustrations if that's all I can find.

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    $\begingroup$ I'm voting to close this question as off-topic because it is better suited for Biology.SE $\endgroup$
    – AliceD
    Mar 26, 2015 at 12:48