This is a neuron (a nerve cell) in the spinal cord that is stained with the Kluver-Barrera technique. You can clearly see the nucleus and dark stained nucleolus in the center of the cell. Labeled D and A are the dendrite and axon which, respectively, serve as the entrance and exit of electrical neural excitations, or impulses. Like donkeys, who kick up their hind legs when bothered, nerve cells get excited very easily. There are 1000 billion neurons in the human body. I don't know how many neurons there are in a donkey.
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