Dictionary:

cerebrum

  (sĕr'ə-brəm, sə-rē'-)

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The large rounded structure of the brain occupying most of the cranial cavity, divided into two cerebral hemispheres that are joined at the bottom by the corpus callosum. It controls and integrates motor, sensory, and higher mental functions, such as thought, reason, emotion, and memory.

[Latin, brain.]

The largest portion of the brain. Operating at the highest functional level and occupying the upper part of the cranium, the cerebrum consists of two hemispheres united at the bottom by commissures of large bundles of nerve fibers. As with all parts of the nervous system, each part of the cerebrum has highly specific functions (for example, a specific outer cortical area controls voluntary chewing, whereas certain inner subcortical areas are involved in involuntary jaw posture).

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Part of the forebrain consisting of a pair of large cerebral hemispheres. The surface of the hemispheres is a highly folded layer of grey matter and is called the cerebral cortex. Underneath the cortex is white matter, which includes the basal ganglia. The right hemisphere appears to be mainly concerned with sensory and motor functions on the left side of the body. and the right with those on the left side of the body. The hemispheres are interconnected by a band of nervous tissue (the corpus callosum). It is believed that this band transfers information from one side of the brain to the other, so that memory can be duplicated in both hemispheres.

The largest part of the brain, consisting of two lobes, the right and left cerebral hemispheres. The cerebrum controls thought and voluntary movement. (See cerebral cortex, left brain, and right brain.)

The main portion of the brain, occupying the front part of the cranial cavity; its two cerebral hemispheres are united by the corpus callosum. The term is sometimes applied to the postembryonic forebrain and midbrain together or to the entire brain. See also brain.

Four major lobes of the cerebrum. By permission from Cunningham JG, Textbook of Veterinary Physiology, Saunders, 2002