The cerebrum is the largest part of the brain that allows you to think, make decisions, imagine, etc. It contains about 10 billion neurons, and about 50 trillion synapse. Th
…e surface of the cerebrum is called the cerebral cortex, composing of 6 layers of neurons (nerve cells), which is above white pathways. There are also ridges called gyri (singular: gyrus) and valleys called sulci (singular: sulcus). Some Sulci are long and are convenient boundaries between 4 areas of the cerebrum called lobes. The furthest forward is called the frontal lobe and is the most important because of its use for intelligence. http://webspace.ship.edu/cgboer/genpsycerebrum.HTML (MORE) 
