Modeling a brain

Well I am a beginner and I would like to make a model of a human brain in blender. The problem is I dont know how:confused:
Can somebody suggest some methods / approaches to modeling irregular shaped objects like this?
Thanks in advance

The easiest way would be to use the sculpt tools after you’ve made a simple base mesh in the form of a brain shape http://wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/Meshes/Editing/Sculpt_Mode