In this revision of his father’s anatomical treatise, Thomas Bartholin included the first depiction of the fissure of Sylvius, the lateral cerebral fissure, and the only part of the surface of the cerebral hemispheres to be given a name between 1641 and end of the 18th century when Reil described the "island of Reil" (1796; No. 1387). Sylvius (Franciscus de Le Boë) made his neurological observations in 1637 but did not publish them officially until issuing his Disputationes medicarum pars prima (Amsterdam, 1663). Sylvius collaborated with Bartholin on the above work, publishing in it ten illustrations of the brain after his own drawings.