The Human Brain

Topics: Brain, Neuron, Central nervous system Pages: 4 (2410 words) Published: October 8, 1999
INTRODUCTIONThe human body is divided into many different parts called organs. All of the parts are controlled by an organ called the brain, which is located in the head. The brain weighs about 2.75 pounds, and has a whitish-pink appearance. The brain is made up of many cells, and is the control centre of the body. The brain flashes messages out to all the other parts of the body. The messages travel in very fine threads called nerves. The nerves and the brain make up a system somewhat like telephone poles carrying wires across the city. This is called the nervous system.The nerves in the body don't just send messages from the brain to the organs, but also send messages from the eyes, ears, skin and other organs back to your brain. Some nerves are linked directly to the brain. Others have to reach the brain through a sort of power line down the back, called the spinal cord. The brain and spinal cord make up the central nervous system.The brain doesn't just control your organs, but also can think and remember. That part of the brain is called the mind.PROTECTING THE BRAINTwenty-eight bones make up the skull. Eight of these bones are interlocking plates. These plates form the cranium. The cranium provides maximum protection with minimum weight, the ideal combination. The other twenty bones make up the face, jaw and other parts of the skull.Another way the brain keeps it self safe is by keeping itself in liquid. Nearly one fifth of the blood pumped by the heart is sent to the brain. The brain then sends the blood through an intricate network of blood vessels to where the blood is needed. Specialized blood vessels called choroid plexuses produce a protective cerebrospinal fluid. This fluid is what the brain literally floats in.A third protective measure taken by the brain is called the blood brain barrier. This barrier consists of a network of unique capillaries. These capillaries are filters for...

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    GLOSSARY
  • artificial hearing: When a person is able to hear but not naturally.
  • artificial seeing: When a person is able to see but not naturally.
  • blood brain barrier: A set of special capillaries that are only found in brain. There purpose is to filter the blood so only oxygen, glucose and water are able to enter the brain. Unfortuantly they don 't prevent narcotics from entering the brain.
  • brain: An organ that is pinkish-white in appearance and is located in the skull. This organ controls almost everything that the body does.
  • brain grafting: Brain grafting is the process of taking a thin layer of brain skin from the donor and moving to new host.
  • brainstem: This is what the brain had used to be early evolution, but now it only controls our basic functions such as breathing and heart rate.
  • capillaries: Tiny blood vessels.
  • cells: What all living thing are built from.
  • central nervous system: This the brain and spinal cord put together. Also see: brain, spinal cord.
  • cerebellum: This part of the brain makes sure that all of your body works together. It also keeps your balance.
  • cerebral cortex: This is one of the most important parts of the brain. It also is produces our thoughts, stores our memories, and plans.
  • cerebrospinal fluid: This what the brain floats in.
  • cerebrum: The cerebrum is split in to two different sides. Left and right. It is located at the front of the head.
  • choroid plexuses: These special blood vessels are what produce the cerebrospinal fluid.
  • cortex: This is the outer layer of the cerebrum.
  • cranium: This is the part of the skull that holds the brain.
  • diseases: Illnesses that can be terminal.
  • electrodes: They are made out metal and emit electricity, usually very little.
  • glucose: This is a combination of sugar and water.
  • grey matter: Mainly made from the cell bodies of neurons.
  • hemisphere: These are the two different part of the cerebrum. Almost all of the brain 's work is done there.
  • hormones: Chemicals that can change the chemical make up of your physical body.
  • hypothalmus: This part of the brain is located above the brainstem. It controls basic drives such as hunger and sex.
  • medulla: The medulla is almost right behind the brainstem. It helps you to digest your food.
  • mind: Not just the brain but the actual consciousness that we have.
  • nerves: Pathways that the brain uses to send messages to and from different parts of the body.
  • nervous system: The whole system of nerves that attach to the spinal cord.
  • organs: Important part of the body. The brain, heart and lungs are examples of organs.
  • Parkinson 's Disease: This disease causes the victim to have seizures.
  • pituitary: The pituitary produces hormones.
  • pons: A band of nerve fibre that connect the back the brain to the middle.
  • skull: The skull is made up of twenty-eight bones. It is located above the spinal cord. It also contains the brain.
  • spinal cord: This cord goes down your back. Almost all nerves in the body are connected to the spinal cord.
  • thalamus: The thalamus a sort of relay room. It gets messages from the lower brain area and sends them to the higher brain.
  • transplant: To transplant is to take something from one person and put it into another person.
  • white matter: White matter is tissue made from nerve fibres.
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