Louis Jacobsohn-Lask

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From left to right (standing) Dr S. Kalischer, Dr Edward Flatau, Dr L. Jacobsohn-Lask, Dr B. Pollack. Berlin, ca 1900.

Louis Jacobsohn-Lask (1863 in Bromberg - 1941 in Sevastopol) was a German neurologist and neuroanatomist. He studied medicine at the University of Berlin under Heinrich Wilhelm Waldeyer, Rudolf Virchow, Emil du Bois-Reymond, Ernst Viktor von Leyden and Robert Koch. In 1899 Jacobsohn and Edward Flatau wrote Handbuch der Anatomie und vergleichenden Anatomie des Centralnervensystems der Säugetiere, which included one of first attempts to classify sulci and gyri of human brain cortex. In 1904 he wrote, together with Flatau and Lazar Minor, another monograph, Handbuch der pathologischen Anatomie der Nervensystems. He described a finger flexion reflex called Bekhterev-Jacobsohn or Jacobsohn reflex. In 1936 he emmigrated with his wife, Berta Jacobsohn-Lask (married in 1916), to Soviet Union.