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Otfrid Foerster (; 9 November 1873 – 15 June 1941) was a German neurologist and neurosurgeon, who made innovative contributions to neurology and neurosurgery, such as rhizotomy for the treatment of spasticity, anterolateral cordotomy for pain, the hyperventilation test for epilepsy, Foerster's syndrome, the first electrocorticogram of a brain tumor, and the first surgeries for epilepsy. He is also known as the first to describe the dermatomic area (an area of skin that is supplied by a single pair of dorsal nerve roots), and he helped map the motor cortex of the cerebrum.Foerster O. Motorische Felder und Bahnen. In: Bumke H, Foerster O, eds. Handbuch der Neurologie IV. Berlin: Springer-Verlag;1936; 49–56
Foerster's student years occurred in a time when neurology was starting to develop independently from internal medicine and psychiatry under the influence of, among others, Jean-Martin Charcot (1825-1893), Wilhelm Heinrich Erb, William Richard Gowers (1845-1912) and particularly Karl Wernicke, who became well known by his direction toward functional localization approaches. By cooperating with Wernike, Foerster's great interest on the anatomy of the central nervous system was excited. The two researchers published together in 1903 an anatomical atlas of the brain ( Atlas des Gehirns). At the time, the several schools of neurology were focused essentially on to diagnosis; because achieving an effective therapy was hardly possible. It was Foerster who took forward the idea of using physical therapy as a new way of treating patients with neurological disturbances. From this work arose his theoretical interest on the disturbances of motor coordination in the execution of movements: this resulted in the topic of his dissertation in 1902, a work which attained a great actuality in connection with the systematic introduction of rehabilitation medicine into neurology. The involvement of in the genesis of muscular spasticity suggested its possible treatment by surgical interruption of the sensory branch of the thoracic and lumbar nerves (rhizotomy), and Foerster developed in 1908 an operation to cut the posterior sensory root in order to alleviate spasticity.
In 1915 Foerster first reported on his innovative results concerning the neurosurgery of nerve damage by shot , as well as other kinds of spinal cord and brain damage.
From 1922 to 1924 Foerster went to Russia as he attended Vladimir Lenin after his stroke. When his most famous patient died, he was asked to suggest a scientist who could examine Lenin’s brain after the autopsy. He recommended Oskar Vogt. As the most important of all the foreign consultants, his signature appeared on all the documents about the treatment and the death of Lenin. Even if he has not cooperated with the National Socialists, his finances were restricted and his professional activities curtailed. He was put under surveillance by the german authorities. This was due to : his past connections to Lenin; the fact that his wife was partly Jewish; Something hidden : a biography of Wilder Penfield. Jefferson Lewis, Doubleday and Co., 1981. . ( read online) Page 159 and the 1932's Rockefeller Foundation grant, urged by Foerster’s American friends, who funded the modern laboratory building of the Institute of Neurology. In 1934, the same year the building was built, he was deprived of his extraordinary professorship and in 1938 was relieved of the function of university professor.
In the time between the two world wars (1925 to 1935) Breslau became a place of attraction for training neurologists and neurosurgeons, particularly those coming from the United States. One of his early students coming from that part of the world was Wilder Penfield (1891-1976), who continued Foerster's work on the analysis of the cerebral cortex's command of movement and the study of epilepsy. Other students were Percival Bailey, who developed a new classification of , and Paul Bucy, discoverer of the famous Klüver-Bucy syndrome, who made fundamental work on the organization of motor cortex, and Robert Wartenberg (1897-1956, discoverer of the Wartenberg's syndrome). Other eminent visitors were Alfred Adson, Max Peet, Edgar Kahn, John Fulton and Margaret Kennard.
One of Foerster's important methods was to use local anaesthesia to keep brain surgery patients awake. While they lay there, Foerster would poke at their brain with an electronic needle, and use the subsequent motor reactions (hand movement, finger movement, etc.) to learn about the brain's motor cortex.
He received the Hughlings Jackson Memorial Medal, which he cherished the most of all his academic honors during the second International Neurological Congress in London in 1935. But he received no single German honor between 1933 and his death.
Foerster died in 1941 in Breslau, at age 67.
Described by his biographers as a giant of neurosurgery, a man of towering intelligence, kindness and charm, he commanded several languages fluently and was a prolific lecturer and writer, having published more than 300 papers and several books. His name has been honoured by the German Society of Neurosurgery by the Otfrid-Foerster-Medaille und -Gedächtnisvorlesung (Otfrid Foerster Medal and Memorial Lecture), created on August 26, 1953.
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