German neuroanatomist, psychiatrist and neuropathologist. He is mainly remembered today for his research of myelinogenesis.
He received his education at the University of Leipzig and in 1884 became professor of psychiatry there. In 1882, he became director of the Clinical Institute of Psychiatry and Neurology at Leipzig. He made personal investigations of the European systems for the treatment of the insane, on which he was a recognized authority. He spent over fifty years of his medical career at Leipzig.
Although Flechsig contributed much in his study of neurological disorders, he is mainly remembered today for his research of myelinogenesis. Flechsig was the treating psychiatrist for Daniel Paul Schreber, whose memoir inspired Sigmund Freud to publish a detailed analysis of the case in 1911. Flechsig’s work has still not been rediscovered widely but his map was reprinted and discussed in Fuster’s “Cortex and Mind”.
Myelinogenesis is a technique he pioneered in which he studied brains of the late term fetus and newborn by staining for myelin. Between about two months before and after birth, most of the cerebral cortex becomes myelinated. The order in which this happens appears to reflect the evolutionary order of mammals from less to more complex. He derived a map of the cerebral cortex divided not by histology (as Korbinian Brodmann did) but by order of myelination.
He died 22 July 1929, Leipzig.

Link to Wikipedia biography