The brain is a complex organ composed of many parts. The MEDULLA, STEM, LOBE, and cerebrum are all components of the brain. The MEDULLA is a 7-letter term that refers to the lower part of the brainstem, which is responsible for controlling vital functions such as breathing and heart rate. The STEM is a 4-letter term that refers to the midbrain, which is responsible for vision, hearing, and movement. The LOBE is a 4-letter term that refers to the four distinct regions of the cerebral cortex, which are responsible for higher-level cognitive functions such as language, memory, and decision-making. Finally, the cerebrum is an 8-letter term that refers to the largest part of the brain, which is responsible for conscious thought, emotion, and behavior.