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Nervous System
This category is for questions about the mechanical and chemical process of reactions to internal and external stimuli, ranging from the brain down to the spinal cord, and all nerves, cells and tissues in between.
3,047 Questions
Do the post-ganglionic sympathetic fibers release acetylcholine?
No, post-ganglionic sympathetic fibers mostly release norepinephrine.
But they do release some ACh to the sweat glands, which causes concurrent vasodilation of surrounding blood vessels (paired with release of bradykinin from sweat glands).
Persistent severe burning pain that usually follows an injury to a sensory nerve is known as?
causalgia
What are the diseases of the central nervous system?
Motor neuron disease, syphilis, parkinsons, alzheimers, dementia, cerebral palsy, cancer, PANDAS,
1. Strokes
2. Brain tumors (glioblastoma multiforme, astrocytomas, as so forth)
3. Trauma (subdural hematoma, subarachnoid hemorrhage, etc.)
4. Infectious diseases (meningitis, cryptococcus, etc.)
5. Demyelinating diseases
6. Congenital diseases (Down Syndrome, Turner Syndrome, Tay-Sachs, etc.)
7. Autoimmune diseases (Lupus cerebritis, etc.)
8. Parkinson's Disease, Huntington's Disease.
9. Dementias (Alzheimer's Type, Vascular Type, Normal Pressure Hydrocephalus, etc.)
Mental illnesses, diseases, and disorders all affect the brain. Some of these are ADD, manic/depressive, depression, OCD, multiple personality disorder, PTSD, Schizophrenia, Parkinson's, and so on.
Alcoholism, a chronic illness involving the excessive ingestion of alcohol. Alcoholism is thought to come from a combination of a wide range of physiological, psychological, social, and genetic factors. It is characterized by an emotional and often physical dependence on alcohol, and it frequently leads to brain damage or early death.
Altitude Sickness or Mountain Sickness, condition caused by reduced oxygen pressure at high altitudes, sometimes occurring in hikers due to rapid ascent to high altitudes.The common symptoms of altitude sickness are headache, shortness of breath, sleep disturbances, and sometimes nausea.
Alzheimer's Disease, is a progressive disease of the brain characterized by confusion, loss of memory, disorientation, restlessness, speech disturbances, inability to carry out normal movements, and hallucinations. It usually starts after age 65, but there is a rare and very aggressive form of the disease, known as early-onset Alzheimer's disease, that can affect people as young as age thirty. The doctors ability to diagnose Alzheimer's disease has improved over the years, but final diagnosis can be confirmed only at autopsy.
Amnesia, loss of memory. It may be caused by brain injury or cerebral arteriosclerosis, or by functional nervous disorders, such as hysteria. Amnesia may be total, with complete loss of recall; or partial, occurring only immediately before or after a traumatic event; or systematic, relating to a particular type or group of experiences. Amnesia is a symptom rather than a disease, and treatment attempts to determine and remove the basic cause.
Autism , is a disorder that impairs development of a person's ability to communicate, interact with other people, and maintain normal every- day activities. Symptoms of autism usually begin during infancy. Autistic infants may stiffen up or go limp when picked up by parents rather than clinging or cuddling up to them. Autistic infants often show little or no interest in other people and have trouble with social behaviors. Autistic children also have difficulties with language. Autism results from biological abnormalities in brain structure and function. Studies have found that autistic people have abnormally low blood flow to certain parts of the brain and reduced numbers of certain brain cells.
Concussion of the Brain, injury to the brain from a fall or a blow to the head, usually with loss of consciousness. When you have a concssion you do not want to take aspirin for the pain. The doctors recommened that you do not let the person fall asleep. Pressure on the brain stem slows down your breathing and your pulse rate goes down. More symptoms include pallor, sweating, and a drop in blood pressure. Dizziness, nausea, and a dull, restless feeling often follow a return to consciousness. Aftereffects such as headaches, dizziness, and nervousness may continue for several days, weeks, or even years after the initial injury. A concussion may temporarily or permanently damage the nerve tissue, causing amnesia, irritability, and fatigue. Memory is sometimes affected. Recovery from a concussion is usually complete.
Epilepsy, called seizure disorder. It is a brain disorder that briefly interrupts the normal electrical activity of the brain. It causes seizures, by a variety of symptoms including uncontrolled movements of the body, disorientation or confusion, sudden fear, or loss of consciousness. Epilepsy can also result from a head injury, stroke, brain tumor, lead poisoning, genetic conditions, or severe infections like meningitis or encephalitis.
Fainting, dizziness or weakness accompanied by brief loss of consciousness, associated with insufficient oxygen in the brain. The cause is usually a disturbance in blood circulation due to fatigue, pain, shock, abnormal blood pressure, arterial blockage, or heart failure. The person fainting should be placed in a position that will quickly bring blood to the brain.
Headache, pain in any part of the head.The majority of headaches belong to one of three main groups: migraine, a recurrent, severe headache. Some headaches can be accompanied by nausea and sometimes loss or impaired vision. Most tension headaches can be treated with mild analgesics such as aspirin and acetaminophen.
Mental Retardation, disorder in which a person's overall intellectual functioning is well below average, with an intelligence of around 70 or less. People with mental retardation also have trouble with everyday situations. The impairment may interfere with learning, communication, self-care, independent living, social interaction, play, work, and safety. Mental retardation appears in childhood, before age 18.
Stroke, is damage to the brain from blockage in blood flow and loss of blood from blood vessels in the brain. Without oxygen and nutrients from blood in the circulatory system, sections of brain tissue quickly deteriorate or die, resulting in paralysis of limbs or organs controlled by the affected brain area. Rehabilitation from stroke requires help from neurologists, physical therapists, speech therapists, and other medical persons
... and quite a few more.
Acoustic Neuroma
Acquired Brain Injury
Agenesis Corpus Callosum
Alzheimer's Disease
Amyotrophic Lateral Diseases
Aneurysm
Aphasia
Arteriovenous Malformation
Batten Disease
Behcet's Disease
Blepharospasm
Brain Tumour and Brain Cancer
Cerebral Palsy
Cervical Dystonia
Charcot-Marie-Tooth Disorder
Chiari Malformation
Chronic Inflammatory Demyelinated Polyneuropathy
Coma and Persistent Vegetative State
Concussion
Creutzfedlt-Jakob Disease
Dementia (non-Alzheimer type)
Down Syndrome
Dysautonomia
Dyslexia
Dyspraxia
Dystonia
Encephalitis
Epilepsy
Essential Tremor
Friedreich's Ataxia
Gaucher Disease
Guillain-Barre Sydrome
Huntington's Disease
Hydrocephalus
Leukodystrophy
Meniere's Disease
Meningitis
Meningococcal Disease
Migraine
Motor Neurone Disease
Multiple Sclerosis
Muscular Dystrophy
Myasthenia Gravis
Narcolepsy
Parkinson's Disease
Peripheral Neuropathy
Prader-Willi Sydnrome
Progressive Supranuclear Palsy
Restless Legs Syndrome
Rett Syndrome
Shy Drager Syndrome
Sleep Disorders
Spasmodic Dysphonia
Stroke
Subarachnoid Haemorrhage
Sydenham's Chorea
Tay-Sachs Disease
Tourette Syndrome
Transient Ischaemic Attack
Transverse Myelitis
Trigeminal Neuroalgia
Tuberous Sclerosis
Von-Hippel-Lindau Syndrome
One brain disease is called polymicrogyria, also called PMG. People who have PMG can never be able to walk, talk, move by themselves, understand people, and their symptoms are drooling, crossed eyes, seizures, and many other things.
Diseases of the brain are known as 'neurological disorders.' Psychological disorders also fall into this category, though they are usually branched off due to the vast amount of them, and the fact that many can be treated via therapy.
There are far too many neurological/psychological disorders out there than can be named in this post, but some common ones are schizophrenia, Alzheimer's, Huntington's Chorea, Parkinson's Disease, Seasonal Anxiety Disorder, etc.
What nervous system division is referred to as the fight or flight system?
The fight or flight actually has nothing to do with the vertebra at all. The Autonomic and Somatic Nervous systems which are included in the Peripheral Nervous system completely control the Fight or Flight response. The Autonomic controls all the nerves of all Voluntary Functions of the body and the Somatic controls the Non-Voluntary functions. The situation that activates this response is registered in the brain which sends signals to specific parts of the brain which are all included in the Central Nervous System or CNS. Such as, the Frontal lobe which would contain all logical thought processes in decision making as well as coordination. The Parietal Lobe which all senses and perception of the situations around you and so on through all Four Major Lobes. The CNS sends signals to the PNS which is divided. All signals from the frontal lobe would be sent to the Autonomic Nervous System because your thought process as well as being able to coordinate running or hiding is voluntary. The functions of the Parietal lobe would be sent to the somatic nervous system because it contains functions that do not require thought process such as breathing, increase in adrenaline and Pupil dialation.
What is the function of the peripheral system and its function?
the main function of the peripheral is to connect the centeral nervous system with limbs and organs.
What is a neuron that transmits a nerve impulse toward the central nervous system is called what?
A sensory neuron transmits a nerve impulse towards the central nervous system. These nerve cells activated by input, transmits sensory information.
What part of the nervous system helps you to write?
the left cerebral hemisphere as it is responsible for speech, reading, and writing.
What creates the myelin sheath in the PNS?
Schwann cells make the myelin sheath in the PNS. Each of the Schwann cells myelinate their own segment of the axon, they work together to make the myelin sheath.
What are early signs for a stroke?
- Sudden weakness or numbness of the face, arm or leg on one side of the body;
- Sudden dimness or loss of vision, particularly in one eye;
- Loss of speech, trouble talking or understanding what others are saying;
- Sudden severe headache, with no known cause;
- Unexplained dizziness, unstable walking or falling, especially along with any of the other symptoms.
This is a technique you can remember of how to spot a stroke:
F. Face, has their face fallen of one side? Can they smile?
A. Arms, can they raise both arms and keep them there?
S. Speech, if their speech slurred?
T. Time, Just like a fire, it's time to call the emergancy services.
What are the two categories of nerves belonging to the peripheral nervous system?
The peripheral nervous system is the nervous system outside of the brain and spinal cord. The two categories belonging to the peripheral nervous system are nerves and ganglia.
How does the nervous system help you in tennis?
for one thing it keeps you from falling flat on your face every time you move. that would help a lot in tennis.
5 signs that the sympathetic nervous system are activated in short term?
Ø Pupil dilation
Ø perspiration production
Ø hair standing on end
Ø increased blood pressure
Ø shaking
Transmission across a chemical synapse always involves a synaptic delay, but with only one synapse (a monosynaptic reflex), the delay between stimulus and response is minimized. In a polysynaptic reflex, the length of delay is proportional to the number of synapses involved.
If you stepped on a tack how would your nervous system respond?
Your nervous system would respond by sending an electrical message to your brain through your nervous system. Once you have recognized you were hurt, you would go and get a band-aid.
