Myelin

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  • Produced by two types of specialised glial cells
  • Increass rate of conduction
  • current flow restricted to regularly spaced bare patches called Nodes of Ranvier
  • Comprises a phospholipid bil;ayer containing specific myelin membrane proteins
  • Major myelin group of genes comprises three genes encoding protein zero (P0), myelin basic protein (MBP) and proteolipid protein (PLP)
  • They possess adhesive properties
  • Defective function of myelin leads to disease.
    • Shiverer mouse has defect in MBP gene
  • Autoimmune attack of myelin sheath can lead to demyelination  (often aimed at MBP) this can lead to multiple sclerosis

 

6.4 MYELINATION [Neuro]

Measurement of whole-nerve conduction velocity.
Differences between CNS and PNS.
Demyelinating diseases: Multiple sclerosis. *
Conduction block.
 

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