Passage: 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 immortalised 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.

Question: Brown-Sequard is known for his work related to what body part?
spinal cord