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. T
…he 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) 
