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brain
(brān)
that part of the central nervous system contained within the skull; it is divided into the forebrain or prosencephalon, the midbrain or mesencephalon, and the hindbrain or rhombencephalon. The brain is a mass of soft, spongy, pinkish gray tissue that weighs about 1.2 kg in a human being; it is made up of billions
of nerve cells, intricately connected with each other, and contains many nerve centers or areas. Some centers control involuntary functions; others interpret sensations received from the sense organs; and others are related to consciousness and memory. The largest portion of the brain is the cerebrum, part of the forebrain, which is covered by a tough cortex (see cerebral cortex). The brainstem is the lower or caudal, stemlike part of the brain that connects the cerebral hemispheres with the spinal cord and consists of the midbrain, pons, and medulla oblongata. Adjacent to it is the diencephalon, which contains the thalamus, hypothalamus, and related structures.
wet brain
brain edema.
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