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Tuesday, October 4

  1. page Corpus callosum edited Corpus callosum corpus callosum, {http://media-3.web.britannica.com/eb-media/73/74273-003-6C2F…

    Corpus callosum
    corpus callosum, {http://media-3.web.britannica.com/eb-media/73/74273-003-6C2F8500.gif} Medial view of the left hemisphere of the human brain.[Credit: Encyclopædia Britannica, Inc.]bundlebundle of nerve
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    right cerebral
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    hemispheres to communicate. The axons and dendrites of the neurons in the corpus callosum synapse with cortical neurons on symmetrically related points of the ref1101004hemispheres. Thus, electrical stimulation of a point on one hemisphere usually gives rise to a response on a symmetrically related point on the other, by virtue of these callosal connections. The neurons in the corpus callosum also are insulated by a myelin sheath, which facilitates the rapid conduction of electrical impulses between the hemispheres.
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  2. page Corpus callosum edited Corpus callosum View Corpus callosum corpus callosum, {http://media-3.web.britannica.com/eb-m…

    Corpus callosum
    View Corpus callosumcorpus callosum, {http://media-3.web.britannica.com/eb-media/73/74273-003-6C2F8500.gif} Medial view of the left hemisphere of the human brain.[Credit: Encyclopædia Britannica, Inc.]bundle of nerve fibres in the longitudinal fissure of the brain that enables corresponding regions of the left and over 3,000,000 other topics on Qwiki.right cerebral
    {corpus_callosum.jpg}
    hemispheres to communicate. The axons and dendrites of the neurons in the corpus callosum synapse with cortical neurons on symmetrically related points of the ref1101004hemispheres. Thus, electrical stimulation of a point on one hemisphere usually gives rise to a response on a symmetrically related point on the other, by virtue of these callosal connections. The neurons in the corpus callosum also are insulated by a myelin sheath, which facilitates the rapid conduction of electrical impulses between the hemispheres.
    Diseases affecting the corpus callosum include ref1101007Marchiafava-Bignami disease, which is characterized by progressive demyelination of the neurons of the corpus callosum. In addition, agenesis (imperfect development) of the corpus callosum can cause ref1101012intellectual disability and ref1101014seizures. A reduced amount of tissue in the corpus callosum also has been associated with ref1101011attention-deficit/hyperactivity disorder.
    The corpus callosum has played an important role in the elucidation of functions specific to each of the cerebral hemispheres. For example, studies of individuals being treated for epilepsy in whom the corpus callosum has been severed, allowing the two hemispheres to function largely independently, have revealed that the right hemisphere has more language competence than was thought.
    View Corpus callosum and over 3,000,000 other topics on Qwiki.
    Sources
    http://www.britannica.com/EBchecked/topic/138476/corpus-callosum

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  3. page Medulla edited ... A complex network of medullary nerve cells and processes from elsewhere in the central nervous…
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    A complex network of medullary nerve cells and processes from elsewhere in the central nervous system enables the medulla to carry on complex integrative functions. The medulla also contains several functional centres that control ref118891autonomic nervous activity, regulating respiration, heart rate, and digestive processes. Other activities of the medulla include control of movement, relaying of somatic sensory information from internal organs, and control of arousal and sleep.
    The last seven cranial nerves emerge from the medulla, which influences their functional activities. Injuries or disease affecting the middle portion of the medulla may produce paralysis of the opposite side of the body, loss of the senses of touch and position, or partial paralysis of the tongue. Injuries or disease of the lateral medulla may cause loss of pain and temperature sensations, loss of the gag reflex, difficulty in swallowing, vertigo, vomiting, or loss of coordination.
    {http://media-1.web.britannica.com/eb-media/63/59863-003-A186717F.gif} Dissection of the left hemisphere of the brain, showing the internal capsule and middle cerebellar …[Credit: Original preparation by J. Klingler, Anatomical Museum, Basel, Switz.]
    View Medulla oblongata and over 3,000,000 other topics on Qwiki.

    {Medulla.jpg}
    View Medulla oblongata and over 3,000,000 other topics on Qwiki.
    Sources
    http://www.britannica.com/EBchecked/topic/372788/medulla-oblongata
    http://www.qwiki.com/q/Medulla_oblongata

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  4. page Medulla edited Medulla medulla oblongata, also called medulla, the lowest part of the brain and the lowest por…

    Medulla
    medulla oblongata, also called medulla, the lowest part of the brain and the lowest portion of the brainstem. The medulla oblongata is connected by the pons to the midbrain and is continuous posteriorly with the spinal cord, with which it merges at the opening (foramen magnum) at the base of the skull.
    Like the cerebrum and cerebellum, the medulla consists of both ref118890myelinated (white matter) and unmyelinated (gray matter) nerve fibres. In the medulla, however, the normal anatomic relationship of the two is reversed, with the white matter on the outside and the gray matter on the inside, around the fourth ventricle (a fluid-filled cavity formed by the expansion of the central canal of the spinal cord upon entering the brain).
    A complex network of medullary nerve cells and processes from elsewhere in the central nervous system enables the medulla to carry on complex integrative functions. The medulla also contains several functional centres that control ref118891autonomic nervous activity, regulating respiration, heart rate, and digestive processes. Other activities of the medulla include control of movement, relaying of somatic sensory information from internal organs, and control of arousal and sleep.
    The last seven cranial nerves emerge from the medulla, which influences their functional activities. Injuries or disease affecting the middle portion of the medulla may produce paralysis of the opposite side of the body, loss of the senses of touch and position, or partial paralysis of the tongue. Injuries or disease of the lateral medulla may cause loss of pain and temperature sensations, loss of the gag reflex, difficulty in swallowing, vertigo, vomiting, or loss of coordination.
    {http://media-1.web.britannica.com/eb-media/63/59863-003-A186717F.gif} Dissection of the left hemisphere of the brain, showing the internal capsule and middle cerebellar …[Credit: Original preparation by J. Klingler, Anatomical Museum, Basel, Switz.]
    View Medulla oblongata and over 3,000,000 other topics on Qwiki.

    {Medulla.jpg}
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  5. page Restless Legs Syndrome edited ... What research is being done? The National Institute of Neurological Disorders and Stroke (NIN…
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    What research is being done?
    The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes of the National Institutes of Health (NIH) conduct and support RLS research in laboratories at the NIH and at major medical institutions across the country. The goal of this research is to increase scientific understanding of RLS, find improved methods of diagnosing and treating the syndrome, and discover ways to prevent it.
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  6. page Pole Vaulting Case Study edited ... Pole Vaulting Case Study This 23-year-old male suffered a closed head injury at age 17 in whi…
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    Pole Vaulting Case Study
    This 23-year-old male suffered a closed head injury at age 17 in which he landed on his head due to a pole-vaulting accident at a high school track meet. Since the fall, he suffered from bipolar disorder (rapid-cycling mood swings), seizures (2-3 per day), daily headaches, daily neck and back pain, and sleep disorder (he would often be awake for 24-36 straight hours before finally going to sleep and then often would sleep for 24 or more hours). He was taking tegretol for bipolar disorder and pain medication for headaches.
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    and health. {isinbayeva.jpg}
    For additional case studies click here:
    http://www.erinelster.com/CaseStudies.aspx?ConditionID=12
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  8. page Phineas Gage Case Study edited ... Case Study {phineas_gage.jpg} His contractors, who regarded him as the most efficient a…

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    Case Study {phineas_gage.jpg}
    His contractors, who regarded him as the most efficient and capable foreman in their employ previous to his injury, considered the change in his mind so marked that they could not give him his place again. He is fitful, irreverent, indulging at times in the grossest profanity (which was not previously his custom), manifesting but little deference for his fellows, impatient of restraint of advice when it conflicts with his desires, at times pertinaciously obstinent, yet capricious and vacillating, devising many plans of future operation, which are no sooner arranged than they are abandoned in turn for others appearing more feasible. In this regard, his mind was radically changed, so decidedly that his friends and acquaintances said he was “no longer Gage.”
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    To read more about Gage click here:
    http://neurophilosophy.wordpress.com/2006/12/04/the-incredible-case-of-phineas-gage/
    
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  10. page Corpus callosum edited Corpus callosum View Corpus callosum and over 3,000,000 other topics on Qwiki. View Corpus ca…

    Corpus callosum
    View Corpus callosum and over 3,000,000 other topics on Qwiki.
    View Corpus callosum and over 3,000,000 other topics on Qwiki.
    {corpus_callosum.jpg}
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