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    Why is there less white matter in the sacral cord compared to cervical?
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    (Original post by TeenToDoctor)
    Why is there less white matter in the sacral cord compared to cervical?
    Think about it like a single nerve is travelling from the brain to supply each part of the body. As you move from the cervical spine downwards, more of these nerves will leave the spine to innervate things the further down you go. As white matter is just neuronal axons, there is less in the bottom of the spine than the top
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    (Original post by ax12)
    Think about it like a single nerve is travelling from the brain to supply each part of the body. As you move from the cervical spine downwards, more of these nerves will leave the spine to innervate things the further down you go. As white matter is just neuronal axons, there is less in the bottom of the spine than the top
    So is it like a C3 for example you've got axons for the entire spinal cord (C4,5,6 etc etc) but by the time you get to S1 you've only got axons remaining for S2,3,4 etc so the WM decreases?
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    (Original post by TeenToDoctor)
    So is it like a C3 for example you've got axons for the entire spinal cord (C4,5,6 etc etc) but by the time you get to S1 you've only got axons remaining for S2,3,4 etc so the WM decreases?
    Yeah
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    (Original post by ax12)
    Yeah
    Ah, fantastic - thanks for your help!
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    Of course technically there is no spinal cord at L2-3 or below, but if we assume you're talking about nerve roots then yes, as above.
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    It's also worth noting that the cervical part of the spinal cord has an enlargement because a lot of the nerves are going to the brachial plexus to innervate the arm. But this isn't the reason why it's larger than the caudia equina, the reasons already mentioned above answer that question
 
 
 
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