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Definition of CEREBRAL HEMISPHERE. : either of the two hollow convoluted lateral halves of the cerebrum â see brain illustration.
Cerebrum/Cerebral Hemispheres. The largest area of the brain is the cerebrum, which consists of the left and right cerebral hemispheres. Generally speaking, the right cerebral hemisphere controls the left side of the body and the left cerebral hemisphere controls the right side of the body.he midbrain is the short portion of the brain stem between the pons and the cerebral hemispheres. The top of the midbrain is called the tectum (or tectal area). The third and fourth cranial nerves originate in the midbrain. Pons.