Who discovered that the brain and spinal cord are not solid masses of neurons?

Name: Who discovered that the brain and spinal cord are not solid masses of neurons?
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Santiago Cajal is known for his pioneering work in neuroscience, particularly for his discovery that the brain and spinal cord are made up of individual cells or neurons, rather than being solid masses. This foundational insight helped establish the neuron doctrine, which is the basis for much of modern neuroscience.

Who Discovered That the Brain and Spinal Cord Are Not