The largest and most prominent structure of the
brain. The inner core is composed of white matter: the outer covering is made up
entirely of gray matter. The human cerebrum consists of perhaps 15 billion cells
and is the latest brain structure to have evolved. It is involved in processing
and interpretation of sensory inputs, control over voluntary motor activity,
consciousness, planning, and execution of action, thinking, ideating, language,
reasoning, judging, and the like; in short, all of those functions most closely
associated with the so-called higher mental functions.