Bigger that Purkinje cerebellar neurons, the Betz pyramidal neurons (aka the giant pyramidal neurons) can have up to 100 micrometers in diameter. They are located in the fifth layer of the grey matter in the primary motor cortex. And they were discovered by a Ukrainian who did not receive the just place he deserves in the history of neuroscience, as most books on the subject ignore him. So let’s give him some attention.
Vladimir Alekseyevich Betz (1834–1894) was a professor of anatomy and a histologist at the Kiev University. Just like with Pavlov, sometimes there is nothing spectacular or weird or bizarre in the life of a great thinker. Betz was a child of a relatively wealthy family, went to good schools, then to Medical School, where he showed interest in the anatomy department. He continued his postgraduate studies in the West (that is Germany and Austria) after which he returned home where he got a position as a professor at his Alma Mater where he stayed until he died of heart problems at the age of 60.
During his PhD, which was on the blood flow in the liver, Betz discovered an interest in histology. He was unsatisfied with the quality of the existing staining methods, so he worked for years to improve the fixation and staining methods of the brain tissue. His new methods allowed the cutting and preserving very thin slices and then he described what he saw. But Betz’s genius was in linking his cortical cytoarchitechtonic findings with physiological function, dividing the cortex into the motor and sensory areas. He also made revolutionary observations of the anatomical organization and development and various pathologies.
Original reference (which I did not find): Betz W (1874). Anatomischer Nachweis zweier Gehirncentra. Centralblatt für die medizinischen Wissenschaften. 12:578-580, 595-599.
Reference: Kushchayev SV, Moskalenko VF, Wiener PC, Tsymbaliuk VI, Cherkasov VG, Dzyavulska IV, Kovalchuk OI, Sonntag VK, Spetzler RF, & Preul MC (Jan 2012, Epub 10 Nov 2011). The discovery of the pyramidal neurons: Vladimir Betz and a new era of neuroscience. Brain, 135(Pt 1):285-300. doi: 10.1093/brain/awr276. Article | FREE FULLTEXT PDF
By Neuronicus, 17 December 2015