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What Is The Nervous System & Its Purpose? – In the human body, the nervous system is responsible for detecting & providing changes, controlling our reactions, coordinating and analyzing our senses, storing long and short-term memory, processing our surroundings and assigning movement to our muscles. The nervous system carries its tasks mostly through the brain and the spinal cord, minor organs like the eyes and over 100 billion neurons constantly sending and receiving electric charges to/from the body.  The nervous system is responsible for the wellbeing of every other system in the human body and therefore must be taken care of.  Diseases such as Alzheimer’s &  Scoliosis and conditions such as dementia & paralysis can harm the nervous system. Today, research is being done to further comprehend and find solutions/treatments to the nervous system problems.Central Nervous System: Brain & Spinal Cord – The major organs in the nervous system, the brain and the spinal cord make up the central nervous system(CNS). The CNS is responsible for making the decisions and commands carried out by the peripheral nervous system(PNS).Brain: Best put by Prof. K.Ashwell, “The brain is a main component of a large and complex network that controls every aspect of human life”. What accounts for the numerous functions of brain is the excessive amount of parts it has. Several parts monitor our 5 senses: touch, hearing, sight, taste and smell and actions like talking and moving. To understand what’s happening, imagine eating a pie with a friend. First, the brain’s cortex (outer layer) is divided into several area each attached to a certain sense/action. YUM! The pie your eating tastes great! This is areas like the Somatosensory and sensory association cortices, which process taste and touch, at play. As you think about the pie’s taste, your prefrontal cortex, responsible for cognition and thinking, hard at work. The crackles of the pie crust are received by the ear and sent to the primary auditory cortex, which examines noise/signals. You turn to view your friend. Their face is analysed by the primary visual cortex, which picks up information from the eye . Your friend starts talking, which you understand because of Wernicke’s area. With these areas all working together, they give you a great pie experience. Internal parts of the brain include the cerebrum, cerebellum, pituitary, hypothalamus, hippocampus and amygdala . The hypothalamus regulates body temperature. The cerebellum controls balance & movement. The pituitary produces and releases bodily hormones. The most important is the cerebrum. It’s divided into the “left” and “right” brain. The right side leads abstract ability focusing on creative and artistic skill. The left side leads logical thinking, focusing on knowledge and numerical thinking. The hippocampus is responsible for our memory capacity, which includes short-term memory(short-lasting) and long-term (long-lasting). Our amygdala is responsible for our reactions/responses. The human body either “flys”, “fights” or “freezes” when encounter with a problem. Every single function of the brain is important for us. Spinal Cord: The spinal cord provides the nervous system the “backbone” support to other body systems, the motor division & limbs and establishes the link between the CNS and PNS. The spinal cord is a combination of perhiverhal nerves, who send & receive messages from the brain and bone, which provide protection. The spinal cord could be compared to a tree where the cord itself is the “trunk” and nerves extending outwards to other system can be described as “tree branches.” Because the brain gain insight from our senses, the spinal cord and their nerves are rooted to organs, joints and muscles. Nervous receptors and sensory nerves are located in the eyes, around the heart (circulatory system), the outer skin and epithelial tissue (integumentary system), the lungs (respiratory system) and the liver(), to name a few. When the body interacts with the external physical environment, the receptors, which are sensitive to pain,temperature and touch, pass information to the spinal nerves and to the brain. Functions by internal organs are recorded to the brain up the spinal cord. This relationships gives the nervous system the responsible to control voluntary and involuntary muscles and joints (skeletal system.)The spinal cord and brain both serve important functions to the human body and futhers shows that all systems are dependant on each other.  Peripheral Nervous System: Nerves – The PNS consists mostly of nerves, which are the frontlines of the spinal and provide the information the brain analyze through electrical charges. Nerves are structured with nervous tissue and connective tissue which create string-like fibers. Nervous tissue is a group of nervous cells or neurons. Neurons consists of Eukaryotic cell bodies, dendrites,axons and synapses. Neurons function like a one way street either sending or receive electrical charges. Neuron cell bodies often contain dendrites, which are receivers and axons, which send charges. Neurons send electrical charges from one axon to another neuron’s dendrites over synapses, which are gaps between nerves that conduct though neurotransmitters.Major Diseases – Diseases that affect the nervous system can cause alterations to the brain and spinal cord’s functions and create physical problems like motor paralysis and cause mental issues like dementia. Alzheimer’s and Parkinson’s disease are two diseases that affect the brain and. Scoliosis is a disease that affect the spinal cord.Alzheimer’s: Alzheimer’s is a brain disease and a subset of dementia, which describes a loss of memory, reasoning, think and logic. This is common among the elderly giving them various physical and mental symptoms  Alzheimer’s is caused by inactive nerve cells. This happens when too many plaques (proteins) are produced in the brain, blocks synapses and causes neurons to stop receiving and sending electric charges and get nutrients. Neurons are left functionless and die out. This affects the hippocampus first meaning, an early sign of Alzheimer’s is memory loss. As it pursues, it can affect long term memory, your emotions and your heart rate and breathing. It can lead to confusion, disorientation and misconception. It is currently incurable.Parkinson’s Disease: Parkinson’s disease   Scoliosis: Scoliosis is disease that curves the spinal cord and cause dysfunction Treatment of Major Diseases – Treatment for major diseases include…text The Maintenance Of A  Healthy Nervous System – To maintain a healthy nervous system one must…text what who why when how symptoms