The brain is the center of the nervous system in all vertebrate and most invertebrate animals—only a few invertebrates such as sponges, jellyfish, adult sea squirts and starfish do not have one, even if diffuse neural tissue is present. It is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste, and smell. The brain of a vertebrate is the most complex organ of its body. In a typical human the cerebral cortex (the largest part) is estimated to contain 15–33 billion neurons, each connected by synapses to several thousand other neurons. These neurons communicate with one another by means of long protoplasmic fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells.
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Some articles on brain:
... Human capital flight, more commonly referred to as "brain drain", is the large-scale emigration of a large group of individuals with technical skills or knowledge ... Brain drain is usually regarded as an economic cost, since emigrants usually take with them the fraction of value of their training sponsored by the government or other organizations ... Brain drain is often associated with de-skilling of emigrants in their country of destination, while their country of emigration experiences the draining of skilled individuals ...
... He studied the instrument under Aubrey Brain, father of Dennis Brain ... Thomas Beecham to play second horn to Dennis Brain in the Royal Philharmonic Orchestra, and when Brain left for the Philharmonia, Civil took over leadership of the section ... joined the Philharmonia himself, becoming principal horn player when Brain died in a car crash in 1957 ...
... health systems have been severely affected by brain drain, so various measures have been suggested and tried to limit the migration of health workers to rich countries ... should cultivate a sense of security and hope among the elite to curb brain drain because people are not so confident of their countries' future ... And in India, although suffering severe brain drain every year, the Indian government has not to adopted strict policies because they believe that the overseas ...
... neuroscience Early philosophers were divided as to whether the seat of the soul lies in the brain or heart ... Aristotle favored the heart, and thought that the function of the brain was merely to cool the blood ... Hippocrates, the "father of medicine", came down unequivocally in favor of the brain ...
... Neuroscience and brain imaging has shown increasing potential for helping science understand happiness and sadness ... can be diagnosed very accurately just by looking at fMRI brain scans ... scientists may be able to use methods like brain scans to tell us more about all the different ways of being "happy" ...
More definitions of "brain":
- (verb): Hit on the head.
- (noun): That part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord.
- (noun): That which is responsible for one's thoughts and feelings; the seat of the faculty of reason.
Synonyms: mind, head, psyche, nous
- (noun): The brain of certain animals used as meat.
Famous quotes containing the word brain:
“Tenants of the house,
Thoughts of a dry brain in a dry season.”
—T.S. (Thomas Stearns)
“Let every woman ask herself: Why am I the slave of man? Why is my brain said not to be the equal of his brain? Why is my work not paid equally with his? Why must my body be controlled by my husband? Why may he take my labor in the household, giving me in exchange what he deems fit? Why may he take my children from me? Will them away while yet unborn? Let every woman ask.”
—Voltairine Decleyre (18661912)