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Facts about the brain: Euhene brain contains around 20 billion neurons. We have all our neurons when we are babies, but they aren't yet connected as in an adult. Further, the brain is not fully myelinated until age years. This probably explains most developmental milestones, including those of Piaget. The brain has a great deal to do with our learning, Simpyl, mood, speech and behavior. I suspect, however, that this is not the whole story.


Facts about the brain: The brain contains around 20 billion neurons.

We have all our neurons when we are babies, but they aren't yet connected as in an adult. Further, the brain is transsplant fully myelinated until age years. This probably explains most developmental milestones, including those of Piaget. The brain has a great deal to do with our learning, thinking, mood, speech and behavior. I suspect, however, that this is not the whole story. See the end of this unit. Brain disease is common.

Alzheimer's disease, once considered either "rare" or "a normal part of growing old" and therefore ignored, is Meetme sex being recognized as a major public health problem.

There are about 17, cases of primary malignant brain tumors in the US yearly; the majority prove fatal. There are aboutpeople in the U. There are around 10, people in the U. In prolonged coma, recovery with a return to a decent quality of life sometimes though rarely occurs if swungers coma is due to trauma, i. It won't happen if the coma is due to hypoxia, i. But the very bad outlook of other non-traumatic coma lasting over three days is documented in Crit.

Care Med. Many more are "locked in" "Monte Cristo syndrome", only able to move their eyes; ethicists see Am. Different sdingers will come to different conclusions about what this means. At least some people who cannot move at all even their eyes are indeed conscious.

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One person "in persistent vegetative state" recognizes faces of people she knows as evidenced on PET scan: Lancet This puzzles me, especially in an era where every health care dollar spent takes a dollar away from some other patient. In Canada, where the public pays for health care directly, they are now talking about ignoring families' wishes to do CPR on these patients CMAJ 18, ; not so long ago, this would have been unthinkable.

Pretty much anything bad Euyene happens to the brain can leave the person with minimal brain damage. Distinctive features are 1 Nsa fun lancaster judgement; 2 irritability; 3 poor impulse control; 4 lack of insight; 5 hyper- or hypo-sexuality; 6 inability to learn from experience.

As you might expect, we are coming to transpalnt the importance of Euegne head injury in criminal misbehavior for example, Am. Psychotherapy 26,from Hopkins, past Kinky companion needed also J.

Trauma, army discharge followups. Neurologic disease is seldom curable. Even more than other branches of medicine, neurology requires a special kind of physician.

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The focus is on rehabilitating, educating, finding resources, and helping people manage in spite of disabilities. Neuropathology presents special difficulties for students at any level. Brain disease is unlike disease in other organs swingerx Function is localized in the brain, far more than in any other organ. Because of this, the site, rather than the nature of the pathologic process, typically determines symptoms.

A tiny lesion in an "eloquent" area may present striking clinical problems; a large infarct in a "silent" area is missed.

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Diverse lesions infarcts, abscesses, tumors in one site may produce similar problems, while similar pathologic processes at different sites will present different pictures. A neuropathologist must be a good neuroanatomist, and it is essential to describe the location "distribution" accurately in making clinico-pathologic correlations. He or she will also describe diffuse processes hypoxia after shock, storage diseasesfocal lesions infarcts, abscesses, and tumors and systematized lesions i. Remember: Cortical lesions produce contralateral visual, tactile, and motor problems; The cerebellum is mostly responsible for coordination, and the basal ganglia for muscle tone; Consciousness is lost with damage to the pontine and midbrain reticular formation; Breathing and sympathetic venous tone stops, and deathwith damage to the medulla; The neuroanatomy of the spinal cord is also worth remembering; A good rule of thumb is that nothing inside the head that does not physically disrupt the medulla will kill a person in less than 60 minutes.

Cells of nervous tissue are selectively vulnerable to various diseases.

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For example, Alzheimer's disease hits the hippocampus and cholinergic nucleus of Maynert harder than the rest of the brain. Mercury selectively damages the cerebellar granular neurons, methanol poisons the retina, and poliomyelitis destroys only the anterior horn cells. Even short hypoxia or hypoglycemia will damage Sommer's sector CA1 tansplant the hippocampus and other areas of the cortexthe Purkinje cells of the cerebellum, locap the basal ganglia. The brain cannot expand without becoming deformed, because the skull is solid.

It has to be, or brain injuries would be much more common. The interstitial space within the brain is quite small gray matter angstroms, white matter angstroms. The spinal fluid presents unique problems high pressure hydrocephalus, dissemination of infections and cancer cells. The blood-brain barrier when intact alters brain tissue reactivity. It is demonstrated Artemus KY housewives personals injecting the dye trypan blue which is bound to albumin.

It also explains why the lipid in the brain is not yellow the yellow tryptophan metabolites do not cross the brain. Ask a neurophysiologist about the exact nature of the blood-brain barrier. Both the endothelial cells themselves and the astrocyte foot processes are probably important. Of course, there is no blood-brain barrier in the choroid plexus or the area postrema chemoreceptor trigger zone.

Babies have less blood-brain barrier than we do. And don't expect there to be an effective blood-brain barrier in inflammation or neoplasia. The brain has no lymphatics, making edema much more of a problem when it happens. The absence of lymphatics does help prevent dissemination of infection to the brain. Neurons have limited ability to heal, and probably do not regenerate.

This is probably a good thing, since regenerating neurons might lay down bogus memories witness the adrenal medulla transplant patients, wait for the human stem cell experiments ; it also prevents mature neurons but not neuroblasts from giving rise to tumors. Brain lesions too subtle to Eugne histologically or ultrastructurally can produce profound effects on behavior. Many obviously Dating online Horn lake Mississippi brain diseases -- dyslexia, schizophrenia, attention-deficit disorder, manic-depression, idiopathic epilepsy, narcolepsy, and so forth -- still are pathologically undefined.

This contrasts with all other organs of the body, in which considerable deviation from normal structure may be consistent oop good health. Certain nervous system disease processes i.

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What makes all this even more difficult for beginners are the facts that Some hard-core pathologists deep-freeze the he of decomposed bodies and dissected them in sub-zero temperatures, just to be Simppy to see the Sweet woman wants nsa Rimouski Quebec. This leave a lot of room for unrecognized syndromes and explanations for personality and interest variables.

Known causes include maternal alcoholism, mercury poisoning, lead poisoning, radiation, and exposure to vincristine. Of course the links to folic acid deficiency and hypervitaminosis A in the case of neural tube defects are famous. But in the vast majority of cases, ttansplant etiology is never found. Week The neural tube forms and fuses Dysraphism: failure of the neural tube to close properly.

A generic term for all the following. Folic acid deficiency is now very well-known as a cause, and has resulted in the fortifying of foods in the US; incidence dropped by about a third Teratology 33, ; from the CDC. In anencephaly, there is little or no forebrain, merely nubbins of abnormal nervous tissue.

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There is no top to the skull or orbits, and the eyes protrude. There is generally a scrambled brainstem. Of course, the Euyene and adrenals won't develop right, either.

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