Nervous system

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Author:
rose11
ID:
265282
Filename:
Nervous system
Updated:
2014-03-06 13:07:54
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anatomy
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Description:
About the nervous system
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  1. Nervous System
  2. Organization of the Nervous system: Structural Classification
  3. Organization of the Nervous system: Functional Classification
  4. Nervous tissue...Structure and Function: Supporting Cells
  5. Nervous tissue...Structure and Function: Neurons: Anatomy
  6. Nervous tissue...Structure and Function: Nuerons: Classification
  7. Nervous tissue...Structure and Function: Neurons: Structural Classification
  8. Nervous tissue...Structure and Function: Neurons:  Physiology
  9. Central Nervous System: Functional anatomy of the Brain: Overview
  10. Central Nervous System: Functional anatomy of the Brain: Cerebral Hemispheres
  11. Central Nervous System: Functional anatomy of the Brain: Dienephalon
  12. Central Nervous System: Functional anatomy of the Brain: Brain stem
  13. Central Nervous System: Functional anatomy of the Brain: Cerebellum
  14. Central Nervous System: Protection of the Central Nervous System : Overview
    • Nervous tissue is soft and delicate and the irreplacable neurons are injured by even the slightest pressure. 
    • Nature had tried to protect the brain and spinal cord by enclosing them in bones,  the membranes and a watery cushion.  
    • Protection from harmful substances in the blood is provided by so called blood brain barrier.
  15. Central Nervous System: Protection of the Central Nervous System: Meninges
    • The three connective tissue membranes covering and protecting the CNS structures are meninges. 
    • The outer most layer, the leathery dura mater, is a doubled layered membrane where it surrounds the brain. One of its layers is attached to the inner surface of the skull,  forming the periosteum. The other called meningeal layer, forms the outermost covering of the brain and continues as the dura mater of the spinal cord. The dural layers are fused together except in the areas where they separate to enclose dural sinuses that correct venous blood. The inner dural membrane extends inward to form a fold that attaches the brain to the cranial cavity. One of these folds, the falx cerebri. Another fold is called the tentorium cerebelli separating the cerebellum from the cerebrum. 
    • The middle meningeal layer is the weblike arachnoid matter.
    • It's thread like extensions span the subarachniod space to attach it to the innermost membrane the pia mater.The delecate pia mater clings tightly to the surface of the brain and spinal cord, following every fold.
    • The subarachnoid space is filled with cerebrospinal fluid. Specialized projections of the arachnoid membrane, arachnoid villi, protrude through the dura mater. The cerebrospinal fluid is absorbed into the venous blood in the dural sinuses through the arachniod villi.
    • Homeostatic imbalance: Meningitis...inflammation of the meninges, is a serious threat to the brain because bacterial or viral meningitis may spread into the nervous tissue of the CNS. Diagnosed by taking a sample of cerebrospinal fluid from the subarachnoid space.
  16. Central Nervous System: Protection of the Central Nervous System: Cerebrospinal
  17. Central Nervous System: Protection of the Central Nervous System: The Blood-Brain Barrier
  18. Brain Dysfunction: Overview
  19. Brain Dysfunction: Traumatic Brain injuries
  20. Brain Dysfunction:Cerebrovascular Accident
  21. Spinal Cord: Overview
  22. Spinal Cord: Gray Matter of the Spinal Cord and Spinal Roots
  23. Spinal Cord: White Matter of the Spinal Cord

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