Med Terms 2

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  • In red I have highlighted the myelin sheath of the neuron. In the CNS, these cells are made by Oligodendrocytes, which I have labeled with yellow.
  • The myelin sheath is used to rapidly transmit signals down a neurons axon, which is the segment I have labeled blue. This sheath also serves as a somewhat protective coating to the neurofibers that make up the axon.
  • But, there is a big difference with your neurons in your Peripheral Nervous System (PNS). 
  • In the PNS, your myelin sheath is different, it is actually made up of  neurolemma. This Neurolemma is made by a cell called a neurolemmacyte.
  • The structure of the neurolemma is different in comparison to the myelin sheath. This structural difference is why M.S. only affects the CNS.
  • The main culprit of this myelin destruction is due to something called a leukocyte. This is also known as a white blood cell. The leukocyte that we are looking at here is specifically called a lymphocyte.
  • A lymphocyte is heavily focused on protecting our immune system. It can split into two different forms. These are known as T-cells and B-cells
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