Smell is the only special sense in which signal reaches the cerebral cortex without passing first through the thalamus of the brain.
The brain is defined as a complex organ which is capable of controlling various actions like thinking, memory,emotions, touch , huger and every regulatory process of our body.
Brain along with the spinal cord make up the central nervous system.The average adult brain is made up of 60% of fat and remaining 40 % comprises of water, carbohydrates, proteins and salts.
It has blood vessels and nerves which include neurons and glial cells.
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