The term BRAIN, PART OF THE can be broken down into four crossword solutions: PIA (3 letters), STEM (4 letters), LOBE (4 letters), and CEREBRUM (8 letters). The brain is the organ responsible for controlling the body's functions and is composed of several parts. PIA stands for pia mater, which is a thin membrane that covers the surface of the brain and spinal cord. STEM is an acronym for the brain STEM, which is the part of the brain that connects the cerebrum to the spinal cord. LOBE refers to the four lobes of the brain, which are the frontal, temporal, parietal, and occipital lobes. Finally, CEREBRUM is the largest part of the brain and is responsible for higher-level thinking and decision making.