The swollen, large and complex part of the central nervous system at the tip of the mesentery is called the brain or encephalon. It is located in the crown. British anatomist Sir Charles Sherrington called it the great raveled knot. Male brain volume is about 1500 cubic cm, female about 1300 cubic cm and average weight is about 1.36 kg. It contains about 100 billion or 1000 billion neurons and 100 billion neurons. The brain consists of three lobes. That is, the brain is divided into three main parts. Procencephalon, Mesencephalon and Rhombencephalon.