Charles-Édouard Brown-Séquard

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Charles-Édouard Brown-Séquard
Charles-Édouard Brown-Séquard.jpg
Charles-Édouard Brown-Séquard
Born (1817-04-08)8 April 1817
Port Louis, Mauritius
Died 2 April 1894(1894-04-02) (aged 76)
Sceaux, France
Residence Mauritius, United States, England, France
Nationality Mauritian
Fields Medicine
Physiology
Neurology
Known for Brown-Séquard syndrome

Charles-Édouard Brown-Séquard FRS (8 April 1817 – 2 April 1894), also known as Charles Edward, was a Mauritian physiologist and neurologist who, in 1850, became the first to describe what is now called Brown-Séquard syndrome.[1]

Early life[edit]

Brown-Séquard was born at Port Louis, Mauritius to an American father and a French mother. He attended the Royal College in Mauritius, and graduated in medicine at Paris in 1846. He then returned to Mauritius with the intention of practicing there, but in 1852 he went to the United States. There he was appointed to the faculty of the Medical College of Virginia where he conducted experiments in the basement of the Egyptian Building.

Subsequently he returned to Paris, and in 1859 he migrated to London, becoming physician to the National Hospital for the Paralysed and Epileptic. There he stayed for about five years, expounding his views on the pathology of the nervous system in numerous lectures which attracted considerable attention. In 1864 he again crossed the Atlantic, and was appointed professor of physiology and neuropathology at Harvard. He relinquished this position in 1867, and in 1869 became professor at the École de Médecine in Paris, but in 1873 he again returned to America and began to practice in New York.

Finally, he went back to Paris to succeed Claude Bernard in 1878 as professor of experimental medicine in the Collège de France, and he remained there until his death, which occurred in 1894 at Sceaux, France. He was buried in Paris at the Cimetière du Montparnasse.[2][3][4]

Brown-Séquard was quite a controversial and eccentric figure, and is also known for self-reporting "rejuvenated sexual prowess after eating extracts of monkey testis". The response is now thought to have been a placebo effect, but apparently this was "sufficient to set the field of endocrinology off and running."[5]

In 1886 Brown-Séquard was elected to the Board of the Sugar Club. He also was a member of the Royal Society of London.

Works[edit]

Brown-Séquard was a keen observer and experimentalist. He contributed largely to our knowledge of the blood and animal heat, as well as many facts of the highest importance on the nervous system. He was the first scientist to work out the physiology of the spinal cord, demonstrating that the decussation of the fibres carrying pain and temperature sensation occurs in the cord itself. His name was immortalized in the history of medicine with the description of a syndrome which bears his name (Brown-Séquard syndrome) due to the hemisection of the spinal cord, which he described after observing accidental injury of the spinal cord in farmers cutting sugar cane in Mauritius.

Far more important is that he was one of the first to postulate the existence of substances, now known as hormones, secreted into the bloodstream to affect distant organs. In particular, he demonstrated (in 1856) that removal of the adrenal glands resulted in death, due to lack of essential hormones. At age 72, at a meeting of the Societie de Biologie in Paris, Brown-Séquard reported that hypodermic injection of a fluid prepared from the testicles of guinea pigs and dogs leads to rejuvenation and prolonged human life. It was known, among scientists, derisively, as the Brown-Séquard Elixir.

Brown-Séquard's research, published in about 500 essays and papers, especially in the Archives de Physiologie, which he helped to found in 1868 along with Jean-Martin Charcot and Alfred Vulpian, cover a very wide range of physiological and pathological subjects.

In the late 19th century Brown-Séquard gave rise to much controversy in the case of supposed modification-inheritance by his experiments on guinea pigs. In a series of experiments extending over many years (1869 to 1891), he showed that a partial section of the spinal cord, or a section of the sciatic nerve, was followed after a few weeks by a peculiar morbid state resembling epilepsy. The offspring of the animals operated on were frequently decrepit, and a certain number showed a tendency to the so-called epilepsy. Although some scientists considered the experiments as evidence for Lamarckian inheritance the experiments were not Lamarckian as Lamarck had rejected that this sort of acquired characteristic was inherited as such experiments did not involve the use and disuse of characters in response to the environment.[6] One explanation for the results was that they show a transmitted disease and not evidence for the inheritance of an acquired character.[7] His experiments are now considered anomalous and alternative explanations have been suggested.[8]

See also[edit]

References[edit]

  1. ^ C.-É. Brown-Séquard: De la transmission croisée des impressions sensitives par la moelle épinière. Comptes rendus de la Société de biologie, (1850)1851, 2: 33-44.
  2. ^ Pearce (1988). "Brown-Séquard's description of spontaneous cerebellar haemorrhage". J. Neurol Neurosurg Psychiatry 51 (5): 634. doi:10.1136/jnnp.51.5.634. 
  3. ^ Laporte, Y. (2006). "Charles-Édouard Brown-Séquard. Une vie mouvementée et une contribution importante à l'étude du système nerveux (Charles-Édouard Brown-Séquard. An eventful life and a significant contribution to the study of the nervous system)". Comptes Rendus Biologies 329: 363–368. doi:10.1016/j.crvi.2006.03.007. 
  4. ^ "Brown-Sequard, Charles Edouard (1817-1894) and Family". Retrieved 2009-05-30. 
  5. ^ The Practice of Neuroscience, p. 199-200, John C.M. Brust (2000).
  6. ^ Stephen Finney Mason. (1956). Main Currents of Scientific Thought: A History of the Sciences. Abelard-Schuman. p. 343. Also see Lamarck's Laws cited in Richard Burkhardt. (1995). The Spirit of System: Lamarck and Evolutionary Biology. Harvard University Press. p. 166
  7. ^ Henry Richardson Linville, Henry Augustus Kelly. (1906). Text Book Of General Zoology. Ginn & Company. p. 108
  8. ^ Aminoff, Michael J. (2011). Brown-Séquard: An improbable genius who transformed medicine. O.U.P. p. 192. 

Further reading[edit]

External links[edit]

Public Domain This article incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.