presented detailed knowledge about skull fractures and their surgical treatments. Avicenna is regarded by some as the father of modern medicine. He wrote 40 pieces on medicine with the most notable being the Qanun, a medical encyclopedia that would become a staple at universities for nearly a hundred years. He also explained phenomena such as, insomnia, mania, hallucinations, nightmares, dementia, epilepsy, stroke, paralysis, vertigo, melancholia and tremors. He also discovered a condition similar to schizophrenia, which he called Junun Mufrit, characterized by agitation, behavioral and sleep disturbances, giving inappropriate answers to questions, and occasional inability to speak. Avicenna also discovered the cerebellar vermis, which he simply called the vermis, and the caudate nucleus. Both terms are still used in neuroanatomy today. He was also the first person to associate mental deficits with deficits in the brain's middle ventricle or frontal lobe. Abulcasis, Averroes, Avenzoar, and Maimonides, active in the Medieval Muslim world, also described a number of medical problems related to the brain. Between the 13th and 14th centuries, the first anatomy textbooks in Europe, which included a description of the brain, were written by Mondino de Luzzi and Guido da Vigevano. Renaissance Work by Andreas Vesalius on human cadavers found problems with the Galenic view of anatomy. Vesalius noted many structural characteristics of both the brain and general nervous system during his dissections. In addition to recording many anatomical features such as the putamen and corpus callosum, Vesalius proposed that the brain was made up of seven pairs of 'brain nerves', each with a specialized function. Other scholars furthered Vesalius' work by adding their own detailed sketches of the human brain. Scientific Revolution In the 17th century, René Descartes studied the physiology of the brain, proposing the theory of dualism to tackle the issue of the brain's relation to the mind. He suggested that the pineal gland was where the mind interacted with the body after recording the brain mechanisms responsible for circulating cerebrospinal fluid. Jan Swammerdam placed severed frog thigh muscle in an airtight syringe with a small amount of water in the tip and when he caused the muscle to contract by irritating the nerve, the water level did not rise but rather was lowered by a minute amount debunking balloonist theory. The idea that nerve stimulation led to movement had important implications by putting forward the idea that behaviour is based on stimuli. Thomas Willis studied