Psychology Definition of BRAIN: n. in humans, refers to the anterior part of the central nervous system which is enlarged in size and encased in the cranium. Only malignant tumors are cancerous. Brain. In humans, the brain weighs about three pounds and consumes a stunning 20-25% of all the body’s energy! Tumors in the brain can be malignant or benign, and can occur at any age. It is the location of perception, ideas, thoughts, conscious movement, and unconscious body functions like heart rate and digestion. Lifestyle has a profound impact on your brain health. Brain disorders can affect anyone. Risk factors are different for different types of brain disorders. Stroke (brain infarction): Blood flow and oxygen are suddenly interrupted to an area of brain tissue, which then dies. brain meaning: 1. the organ inside the head that controls thought, memory, feelings, and activity: 2. used to…. Brain cancer: Cancer of the central information processing center of the body. (1.5 kilograms). It weighs about 3.3 lbs. brain [brān] that part of the central nervous system contained within the cranium, comprising the forebrain (prosencephalon), midbrain (mesencephalon), and hindbrain (rhombencephalon); it develops from the embryonic neural tube. The average male has a brain volume of 1,274 cubic centimeters. To strike a person in, on or upside the head deliberately and violently oftentimes with a blunt object. The brain is a mass of soft, spongy, pinkish gray nerve tissue that weighs about 1.2 kg in a human being. Primary brain tumors cancer initially forms in the brain tissue. Pillars of Brain Health. Secondary brain tumors cancers are cancers that have spread to the brain tissue (metastasized) from elsewhere in the body. A blood clot, or bleeding in the brain, are the cause of most strokes. (i) The forebrain, greatly developed into the cerebrum, consists of two hemispheres joined by a bridge of nerve fibres, and is responsible for the exercise of thought and control of speech. 1 An organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating centre of sensation and intellectual and nervous activity.. The human brain is the largest brain of all vertebrates relative to body size. The brain is the organ located within the skull that is responsible for cognition, mental processes, and control of the body and its functions. What you eat and drink, how much you exercise, how well you sleep, the way you socialize, and how you manage stress are all critically important to your brain health. 1 people chose this as the best definition of brain: The control center, as of... See the dictionary meaning, pronunciation, and sentence examples. Brain Definition. 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