Louis Jacobsohn-Lask (born Louis Jacobsohn; 2 March 1863, in

Bromberg Bydgoszcz ( , , ; german: Bromberg) is a city in northern Poland, straddling the meeting of the River Vistula with its left-bank tributary, the Brda. With a city population of 339,053 as of December 2021 and an urban agglomeration with more ...

– 17 May 1941, in Sevastopol) was a

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...

neurologist and neuroanatomist. He studied medicine at the University of Berlin under

Heinrich Wilhelm Waldeyer Heinrich Wilhelm Gottfried von Waldeyer-Hartz (6 October 1836 – 23 January 1921) was a German anatomist, known for summarizing neuron theory and for naming the chromosome. He is also remembered by anatomical structures of the human body which ...

, Rudolf Virchow, Emil du Bois-Reymond,

Ernst Viktor von Leyden Ernst Viktor von Leyden (20 April 1832 – 5 October 1910) was a German internist from Danzig. Biography He studied medicine at the Friedrich-Wilhelms-Institut in Berlin, and was a pupil of Johann Lukas Schönlein (1793–1864) and Lud ...

and

Robert Koch Heinrich Hermann Robert Koch ( , ; 11 December 1843 – 27 May 1910) was a German physician and microbiologist. As the discoverer of the specific causative agents of deadly infectious diseases including tuberculosis, cholera (though the Vibrio ...

. In 1899 Jacobsohn and

Edward Flatau Edward Flatau (27 December 1868, Płock – 7 June 1932, Warsaw) was a Polish neurologist and psychiatrist. He was a co-founder of the modern Polish neurology, an authority on the physiology and pathology of meningitis, co-founder of medical jou ...

wrote ''Handbuch der Anatomie und vergleichenden Anatomie des Centralnervensystems der Säugetiere'', which included one of the first attempts to classify sulci and

gyri In neuroanatomy, a gyrus (pl. gyri) is a ridge on the cerebral cortex. It is generally surrounded by one or more sulci (depressions or furrows; sg. ''sulcus''). Gyri and sulci create the folded appearance of the brain in humans and other ma ...

of human brain cortex. In 1904 he wrote, together with Flatau and

Lazar Minor Lazar Solomonovich Minor (russian: Ла́зарь Соломо́нович Минор; 17 December 1855 – 1942) was a Russian neurologist who was a native of Vilnius. Minor received his education at the University of Moscow, where he was a stud ...

, another monograph, ''Handbuch der pathologischen Anatomie der Nervensystems''. He described a finger flexion reflex called the Bekhterev-Jacobsohn reflex or Jacobsohn reflex. In 1909 he first described the

pedunculopontine nucleus The pedunculopontine nucleus (PPN) or pedunculopontine tegmental nucleus (PPT or PPTg) is a collection of neurons located in the upper pons in the brainstem. It lies caudal to the substantia nigra and adjacent to the superior cerebellar peduncle. ...

.''Über die Kerne des menschlichen Hirnstamms (Medulla oblongata, Pons und Pedunculus cerebri)'', Berlin, 1909. pag. 58, fig. 22
/ref> In 1936 he emigrated to the Soviet Union with his wife, Berta Jacobsohn-Lask, a

communist Communism (from Latin la, communis, lit=common, universal, label=none) is a far-left sociopolitical, philosophical, and economic ideology and current within the socialist movement whose goal is the establishment of a communist society, a s ...

of Jewish provenance, whom he had married in 1901. He was encouraged to continue his scientific work. They settled in Sevastopol, where Louis Jacobsohn-Lask died in 1941.

References

Ulrike Eisenberg Ulrike is a Germanic female given name. Notable people named Ulrike include: * Princess Ulrike Friederike Wilhelmine of Hesse-Kassel (1722–1787), German noble * Ulrike von Levetzow (1804–1899), German noble and friend of Johann Wolfgang von G ...

. ''Vom "Nervenplexus" zur "Seelenkraft": Werk und Schicksal des Berliner Neurologen Louis Jacobsohn-Lask (1863–1940).'' (Berliner Beiträge zur Wissenschaftsgeschichte, ed. by

Wolfgang Höppner Wolfgang is a German male given name traditionally popular in Germany, Austria and Switzerland. The name is a combination of the Old High German words ''wolf'', meaning "wolf", and ''gang'', meaning "path", "journey", "travel". Besides the regula ...

, vol. 10). Frankfurt am Main, Berlin, Bern, Bruxelles, New York, Oxford, Wien. Frankfurt a. M.: Peter Lang – Europäischer Verlag der Wissenschaften, 2005. 513 pp., 11 fig. * ''Home Away from Home: The Berlin Neuroanatomis Louis Jacobsohn-Lask in Russia''. W: Ulrike Eisenberg: ''Doing medicine together: Germany and Russia between the wars''.

Susan Snell Solomon Susan is a feminine given name, from Persian "Susan" (lily flower), from Egyptian '' sšn'' and Coptic ''shoshen'' meaning "lotus flower", from Hebrew ''Shoshana'' meaning "lily" (in modern Hebrew this also means "rose" and a flower in general), ...

(red.). Toronto: University of Toronto Press, 2006, s. 407. . 1863 births 1941 deaths German neurologists Physicians from Bydgoszcz Jewish refugees from Nazi Germany in the Soviet Union {{Germany-academic-bio-stub