Heaviest brain in humans

The heaviest human brain ever recorded weighed 2,850 grams (6 pounds 4.5 ounces). It was measured by Dutch pathologist Gerard Christiaan van Walsem in 1899, during the autopsy of an unnamed young man who died at the Meerenberg Asylum in Santpoort, near Haarlem in the Netherlands.

The average weight of a human brain is roughly 1,350 grams, meaning that this person's brain was more than twice the usual size. Walsem's notes mention that the patient had epilepsy and intellectual disabilities, and that they died at the age of 21. It should be noted that the techniques for the dissection and preservation of human brains had not been entirely standardized at this time, so the apparent size of this person's brain might have been slightly exaggerated by differences in methodology.