The cerebrum refers to the parts of the brain containing the cerebral cortex (of the two cerebral hemispheres), normally known as Left and Right Brains.
The cerebellum is a region of the brain that plays an important role in motor control. It is also involved in regulating fear and pleasure responses. It has an inherent ability to predict upcoming events and disasters.
The midbrain is a portion of the central nervous system associated with vision, hearing, motor control, sleep/wake, arousal (alertness), and temperature regulation.
The corpus callosum, is a wide, flat bundle of neural fibers beneath the cortex. It connects the left and right cerebral hemispheres and facilitate interhemispheric communication.