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After a peripheral nerve is damaged, it is able to regenerate and reestablish normal function.

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Cajal looked at neurons from a rabbit's retina. He recognized multiple types of ganglion cells which would later help with the realization of functional coupling.

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Cajal studied sensory signals from the muscles of the hands and arms that travel up through the spinal cord to the cuneate nucleus.

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Cajal looked at the glial cells in the spinal cord of a mouse. He correctly proposed that these cells transform into astrocytes as the animal matures.

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In the cerebral cortex of a cat, Cajal studied the directions of neural pathways and found that they only move in one direction.

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Cajal studies the output neurons of the retina, the ganglion cells in lizards. These output neurons vary in size, and this relates to their specialized functions.

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Cajal studied neural activity of mice with Alzheimers, as the mouses condition got worse, you can see the color becoming darker and fading