How was Santiago Ramón y Cajal awarded the Nobel Prize in Physiology or Medicine?

Name: Santiago Ramón y Cajal.
Country: Spain.
Date of Birth: 1 May 1852.
Died: 17 October 1934.
Education: University of Zaragoza.
Subjects Of Study: Neuron.
Known as: Fathering modern neuroscience, Discovery of the neuron Cajal body, Cajal–Retzius cell, Interstitial cell of Cajal, Neuron doctrine, Growth cone, Dendritic spine, Long-term potentiation, Mossy fiber, Neurotrophic theory, Axo-axonic synapse, Pioneer axon, Pyramidal cell, Radial glial cell, Retinal ganglion cell, Trisynaptic circuit, Visual map theory.
Noble Prize Year: Nobel Prize for Peace in 1906, for his investigations of the microscopic structure of the brain made him a pioneer of modern neuroscience.