Which part of the brain is known as the 'Tree of life'? 

Arbour vitae is known as the 'Tree of life'. It refers to the distinctive branching pattern of white matter found in the cerebellum. This branching pattern resembles the branches of a tree, hence the name. The arbor vitae is composed of axons, which are the nerve fibers that transmit signals between different parts of the brain and the body.  Cerebellum is crucial for coordinating movement, balance, and other motor functions.