W9 - SPINAL CORD AND PROTECTION OF CNS

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6 Terms

1
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white matter and tracts

  • mostly myelinated axons

  • axons are organised into tracts

  • tracts replay similar info to same destination

  • ascending tracts - sensory/afferent input to brain

  • descending tacts - motor/efferent input from brain

<ul><li><p>mostly myelinated axons</p></li><li><p>axons are organised into tracts</p></li><li><p>tracts replay similar info to same destination</p></li><li><p>ascending tracts - sensory/afferent input to brain</p></li><li><p>descending tacts - motor/efferent input from brain</p></li></ul><p></p>
2
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gray matter and nuclei

  • most cell bodies

  • cell bodies organised into sensory and motor nuclei

  • sensory nuclei contain cell bodies of interneurons that receive and issue input entering spinal cord

  • motor nuclei contain cell bodies or motor neurons that receive and issue motor input from brain

<ul><li><p>most cell bodies</p></li><li><p>cell bodies organised into sensory and motor nuclei</p></li><li><p>sensory nuclei contain cell bodies of interneurons that receive and issue input entering spinal cord</p></li><li><p>motor nuclei contain cell bodies or motor neurons that receive and issue motor input from brain</p></li></ul><p></p>
3
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protection of brain

  • nervous tissue = soft and delicate - light pressure can injure neoruns

  • protected by:

    • The cranium

    • Meniges

    • Cerebrospinal fluid (CSF)

    • The blood-brain barrier

    • Circle of wills (overcome blockage in blood supply)

4
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Blood-brain barrier

  • protective mechanism

  • helps provide a stable environment for brain

  • formed by glial cells (astrocytes) encourage endothelial cells to form tight junctions

    • ↓ permeability

  • selective permeable

    • keep metabolic waste, proteins, certain toxins, proteins and most drugs out

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blood supply to brain

  • right and left internal carotid and right vertebral arteries take blood to the cerebrum

  • arteries form branches to supply the brain

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Circle of willies

  • provides a constant blood supply (the cerebral arterial circle)

    • unites the anterior and posterior blood supplies

    • provides alternate routes for blood to reach the cerebrum if a vessel is occluded

    • provides a constant blood supply to the cerebrum

<ul><li><p>provides a constant blood supply (the cerebral arterial circle)</p><ul><li><p>unites the anterior and posterior blood supplies</p></li><li><p>provides alternate routes for blood to reach the cerebrum if a vessel is occluded</p></li><li><p>provides a constant blood supply to the cerebrum</p></li></ul></li></ul><p></p>