He was born on 1st of May 1852 in  Madrid. He was from Spain. His father was Justo Ramón Casasús. His mother was Antonia Cajal. He lived in Petilla de Aragón (Navarra) and in Zaragoza. He studied medicine in at Zaragoza. When he was 21 years old and he finished his studies. His important discovers were in the neurophysiology. He was a very important doctor.He was 21 years old and he finished his studies. He died on 17th of October 1934 in Zaragoza.

 Source: wikipedia

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