This is a sympathetic motor ganglion stained with a Hemotoxylin and Eosin stain. There are a lot of little structures labeled on the picture- but they are a bit too complicated to explain here. If you email me I could tell you if I had time. You could also google them. Basically, though, a ganglion is a place where nerves come together and cell bodies are packed together. And, just like when a pufferfish blows up to intimidate predators, ganglia warn the body about impending danger through the flight or fight response. The pufferfish in this picture definitely looks ready to fight. But, more importantly, like the neuron on this slide, the fish is unshaven.
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