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1 (of 10) Portrait of Santiago Ramón y Cajal.

Source: U.S National Library of Medicine, History of Medicine Division Photographer unknown Kindly provided by U.S National Library of Medicine

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2 (of 10) Santiago Ramón y Cajal at work, ca 1915.

Photo: Legado Cajal. Instituto Cajal (CSIC). Madrid.

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3 (of 10) Santiago Ramón y Cajal in his laboratory in Madrid, surrounded by some of his students, ca 1915.

Photo: Legado Cajal. Instituto Cajal (CSIC). Madrid.

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4 (of 10) Santiago Ramón y Cajal at his desk, ca 1890.

Photo: Legado Cajal. Instituto Cajal (CSIC). Madrid.

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5 (of 10) Self-portrait of Santiago Ramón y Cajal in his laboratory in Valencia, ca 1885.

Photo: Legado Cajal. Instituto Cajal (CSIC). Madrid.

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6 (of 10) Pyramidal cells of the cerebral cortex of a cat.

Source: U.S National Library of Medicine, History of Medicine Division Photographer unknown Kindly provided by U.S National Library of Medicine

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7 (of 10) A schematic illustration of a section of the spinal cord depicting the nerve roots. Illustration by Cajal from the book Recuerdos de mi vida.

Source: U.S National Library of Medicine, History of Medicine Division Photographer unknown Kindly provided by U.S National Library of Medicine

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8 (of 10) Neuroglial cells of a cat. Illustration by Cajal from the book Recuerdos de mi vida.

Source: U.S National Library of Medicine, History of Medicine Division Photographer unknown Kindly provided by U.S National Library of Medicine

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9 (of 10) Detail of neural connections. Illustration by Cajal from the book Recuerdos de mi vida.

Source: U.S National Library of Medicine, History of Medicine Division Photographer unknown Kindly provided by U.S National Library of Medicine

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10 (of 10) Various types of nerve structures. Illustration by Cajal from the book Die Retina der Wirbelthiere, Tafel II.

Source: U.S National Library of Medicine, History of Medicine Division Photographer unknown Kindly provided by U.S National Library of Medicine