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Essay on brain structure
Essay on brain structure
Essay on brain structure
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The brain
The brain is the most complex organ in the human body. It produces our every thought, action, memory, feeling and experience of the world. This mass of tissue in our heads has the consistency of butter and weighs approximately 1.4kg. It contains a staggering one hundred billion nerve cells. These nerve cells communicate and connect with each other using tiny electrical impulses and chemical signals. The number and variety of connections these nerve cells make between each other is mind-boggling. Each brain cell can and does connect with thousands or even tens of thousands of other brain cells. These cells in our brains are forming millions of different and new connections every second. The pattern and strength of these connections is constantly changing and it is these
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A large group of brain cells (neurons) fire synchronously at a much faster rate. A seizure is the result of a sudden burst of abnormal electrical activity involving a large group of brain cells. A seizure can cause a variety of changes and sensations the nature of which depends on the part of the brain involved. Seizures cause a disruption in normal brain cell activity. Typically seizures may result in changes in bodily sensations, awareness, behaviour, thinking or emotions; they may cause muscle spasms, loss of consciousness and seizures (also known as convulsions or fits; Engel and Pedley, 1997).
What is epilepsy?
Under certain circumstances anyone can have a seizure. Seizures last a few seconds to a few minutes. Most are over in less than 3 minutes. Epilepsy is only diagnosed when a person has had several seizures. It can affect anyone regardless of age, race or gender but it is most commonly seen in childhood, adolescence, young adults and the elderly. Epilepsy is a common brain condition affecting 1-2% of the entire population of Australia (Australian Bureau of Statistics 2001; JECA 2007).
Causes of
Many people with epilepsy usually have more than one type of seizure and may have other symptoms of neurological problems as well. The cause of epilepsy varies by age of the person, but the majority of the time the cause is unknown. Common causes of seizures by age in Elizabeth Otte’s case would be congenital conditions (Down’s syndrome; Angelman's syndrome; tuberous sclerosis and neurofibromatosis), genetics, head trauma, and progressive brain disease which is rare (Schechter & Shafer, Ltd., 2013, p.1). The diagnosis of epilepsy is based on medical history of the patients including family history of seizures. They ask several of questions to figure of what type of seizures the patients could possibly be suffering from. Doctors then preform test such as EEG, take blood, and study images of your brain. Epilepsy is treated by a neurologist specialist that may or may not subscribe medication depending on the severity and frequency of the seizures. Also treatment can be a change in the patients’ diet or
There are many different types of seizures. Each different types of seizure can have different symptoms or signs that the patient could be going to have a seizure. Some symptoms can vary from loss of consciousness to nausea, vomiting. Some of the causes of seizures are lack of oxygen, infections of the brain, high fever, sleep deprivation, etc.
First off, it is important to understand what a seizure is. A seizure is caused by abnormal discharge of electric stimulation in the brain. They may also be caused by salt imbalances in the blood, gastrointestinal disease, poisoning, head injury, brain disease such as a tumor, a malformed blood vessel, or anything that causes sudden lack of oxygen to the brain.((1).) Seizures are also grouped into different categories depending on how severe they are and also depending on which part of the brain is effected. For example, if the entire brain is involved it is a generalized seizure as opposed to if only a portion of the brain is effected and in that case the seizure is a partial seizure. ((2).) There are two types of partial seizures, simple partial and complex partial. There are also two types of generalized seizures, generalized absence (petit mal) and tonic-clonic (grand mal). The seizures that my sister has are tonic-clonic or grand mal, which are considered the most severe type of seizure to have. With a tonic-clonic seizure, there are two phases. In the tonic phase, the person loses consciousness and falls, as the body grows rigid. In the clonic phase, body extremities jerk and twitch. After the seizure, consciousness returns slowly. ((2).)
Epilepsy is a neurological disorder characterized by recurrent and uncertain intrusions of normal brain function, called epileptic seizure (Fisher et al., 2005). The word epilepsy was derived from the Greek word “attack”. The primitive Greeks thought epilepsy was contagious, and hence people with epilepsy used to live alone (Dam, 2003). It is one of the oldest conditions known to humankind (WHO, 2001a) and still the most common neurological condition affecting individuals of all ages. At any given time, it is appraise that 50 million individuals worldwide have a detection of epilepsy (WHO, 2001b). Epilepsy is charaterised by the incident of at least two unprovoked events of recurrent disruption in neurological function. Epilepsy is not a single prognosis but is a symptom with many fundamental causes. (Nunes et al., 2012).
Epilepsy, also known as “seizure disorder,” or “seizure attack,” is the fourth most common neurological disorder known to mankind, affecting an estimated 2.3 million adults and 467,711 children in the United States. Unfortunately this disorder is becoming far more common and widespread worldwide. This staggering number of cases of people suffering from Epilepsy also involves an average growth rate of 150,000 new cases each year in the United States alone. Generally, many of the people who develop who are a part of the new are mainly either young children or older adults. Your brain communicates through chemical and electrical signals that are all specialized for specific tasks. However, through the process of communication, chemical messengers, also known as neurotransmitters can suddenly fail, resulting in what is known as a seizure attack. Epilepsy occurs when a few too many brain cells become excited, or activated simultaneously, so that the brain cannot function properly and to it’s highest potential. Epilepsy is characterized when there is an abnormal imbalance in the chemical activity of the brain, leading to a disruption in the electrical activity of the brain. This disruption specifically occurs in the central nervous system (CNS), which is the part of the nervous system that contains the brain and spinal cord. This causes an interruption in communication between presynaptic neurons and postsynaptic neurons; between the axon of one neuron, the message sender and the dendrite of another neuron, the message recipient. Consequently, the effects that epileptic seizures may induce may range anywhere from mild to severe, life-threatening ramifications and complications. There are many different types of seizures associa...
Epilepsy is characterized by uncontrolled excessive activity of either a part of, or all of the central nervous system. A person who is predisposed to epilepsy has attacks when the basal level of excitability of the nervous system rises above a certain critical threshold. As long as the degree of excitability is held below this threshold, no attack occurs. Basically, epilepsy can be classified into three major types: grand mal, petit mal, and focal or partial epilepsy.
Not everyone who has a seizure has epilepsy. Epilepsy is a chronic neurological disorder characterized by recurrent, unprovoked seizures. Unprovoked means that there is no immediate cause for the seizure, such as a fever, an infection of the brain, or head trauma. Nearly 10 percent of people will have a seizure during their lifetime; most of these are provoked seizures during an acute illness or condition. These people may never have epilepsy. There are two types of seizures people can have. One is partial seizure or focal they begin in one part of the brain. They cause varied symptoms auras which is a funny feeling in your stomach, staring, chewing, lip smacking, shaking, or stiffness in parts of the body. Generalized seizures are when the entire brain is effected. This causes loss consciousness. One type is grand mal is when the body stiffens and jerks. Another type is petit mal, which is momentary loss of consciousness without abnormal body movement. Some factors of this are infections of the brain this includes meningitis, encephalitis, and brain abscess. Strokes are also a risk of epilepsy. Also alcohol can cause seizures for heavy drinkers when they stop drinking abruptly (withdrawal seizures) and also have a good chance of epilepsy. Epilepsy can also cause brain tumors usually they are slow growing and don't affect them for years. Some other factors that cause epilepsy is age the risk of seizures is higher in young children. Also gender epilepsy is higher in males than in females. The most common treatment for epilepsy is the daily use of anticonvulsant or antiepilectic drugs to prevent seizures. These medications act on brain signals to limit hyperexcitability. While medications do not cure epilepsy, they allow many people to live normal, active lives. Other treatments are vagus nerve stimulation this treatment involves electronic stimulation of the brain using an implanted device like a pacemaker. Another is epilepsy surgery this is when a part of the brain that is causing the seizures is removed so that it prevents it from spreading to anther part of the brain.
Later, the doctors told me I had epilepsy, specifically the type known as grand mal. Immediately, the doctors put me on some medications to prevent the seizures. They also gave my parents a bunch of packets of information about epilepsy. When I got older, some of those packets informed me that 20-25 million people have suffered from an epileptic seizure. Many people grow out of childhood epilepsy or they take medicine to control it. However, there is still a risk of having a seizure even if you take medication. Over the past few years, I have become increasingly aware of the chance of a seizure at any time.
Epilepsy is a condition characterized by recurrent seizures which are unprovoked by any immediately identifiable cause (Hopkins & Shorvon, 1995). It is also known as a seizure disorder. A wide range of links and risk factors are associated with the condition, but most of the time the cause is unknown. Epilepsy is one of the most common neurological disorders, affecting approximately two and half million people in the US and about 50 million worldwide. Though seizures can occur at any age, epilepsy is most commonly seen in children and the elderly. Most respond well to treatment and can control their seizures, but for some it is a chronic illness. A clinical diagnosis is the first step to finding a potential cure for the disorder.
A neuron is a cell that transmits information throughout the human brain and nervous system. The average human has approximately 100 billion neurons and about 90% of the neurons are located in the cerebral cortex. For as many neurons there are in the human brain, there are as many neuroglia which serve to protect and support the neurons. Neurons are unlike any other brain cell because at birth the neurons are able to divide and make new cells. The cells divide and increase in size until about the age of eighteen but they last a lifetime. The most interesting part of neurons dividing occurs in the hippocampus. The hippocampus is an area in the human brain essential to memory and is the only area in the brain where neurons continue to divide and increase in size throughout life. (Mastin,
This paper involves how the brain and neurons works. The target is to display the brain and neurons behavior by sending signals. The nervous system that sends it like a text message. This becomes clear on how we exam in the brain. The techniques show how the brain create in order for the nerves about 100 billion cells. Neurons in the brain may be the only fractions of an inch in length. How powerful the brain could be while controlling everything around in. When it’s sending it signals to different places, and the neurons have three types: afferent neurons, efferent neurons, and the interneurons. In humans we see the old part of emotions which we create memories plus our brain controls heart beating, and breathing. The cortex helps us do outside of the brain touch, feel, smell, and see. It’s also our human thinking cap which we plan our day or when we have to do something that particular day. Our neurons are like pin head. It’s important that we know how our brain and neurons play a big part in our body. There the one’s that control our motions, the way we see things. Each neuron has a job to communicate with other neurons by the brain working network among each cell. Neurons are almost like a forest where they sending chemical signals. Neurons link up but they don’t actually touch each other. The synapses separates there branches. They released 50 different neurons.
The 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.
Most of the body’s functions such as, thinking, emotions, memories and so forth are controlled by the brain. It serves as a central nervous system in the human body. The mind is the intellect/consciousness that originates in the human brain and manifests itself in emotions, thoughts, perceptions and so forth. This means that the brain is the key interpreter of the mind’s content. Jackson and Nagel seem to resist identifying what we call “mental events” with brain events, for different reasons, while J.J.C. Smart takes the opposing view.
The nervous system is composed of all nerve tissue in the body. This organ system forms a communication and coordination network between all parts of the body. It plays a major role in everyday activities such as breathing, walking even blinking. It is made up of nerve tissues to receive and transmit stimuli to nervous centers and initiate response. Neurons are nerve cells that transmit signals from one location of the body to another. With damage to the nervous system the body would not be able to function properly. The body has to be well taken care of in order to insure proper regulation. The two anatomical divisions that work hand in hand to help regulate the nervous system are the central and peripheral nervous system. According to the Campbell’s seventh edition biology book the nervous system is the most intricately organized data processing system on earth. It is a complex collection of nerves and specialized cells.
The most basic elements of a neural network, the artificial neurons, are modeled after the neurons of the brain. The "real" neuron is composed of four parts: the dendrites, soma, axon, and the synapse. The dendrites receive input from other neuron's synapses, the soma processes the information received, the axon carries the action potential which fires the neuron when a threshold is breached, and the synapse is where the neuron sends its output, which are in the form of neurotransmitters, to the dendrites of other neurons. Each neuron in the human brain can connect with up to 200,000 other neurons. The power and processing of the human brain comes from multitude of these basic components and the many thousands of connections between them.