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Message: <blockquote data-quote="TeddyTottie" data-source="post: 2392192" data-attributes="member: 519030">It’s because the nerve that goes through the centre of the wrist (median nerve) only supplies those fingers, so if it is compressed by the palm ligament then only those fingers are affected.  The other side of the ring finger and the little finger are supplied by the ulna nerve which goes through a separate channel and  can also be compressed in its own way, but shows a different pattern of numbness.Edit to add - I watched my surgery because I am utterly unsqueamish and it was fascinating - the median nerve is really substantial, about the thickness of a pencil!Oh, and I was sent for nerve conductivity tests before surgery to confirm the diagnosis because apparently the nerve can be trapped elsewhere which gives similar symptoms, but of course won’t be fixed by that particular op.   Not that anyone really had any doubt!</blockquote>

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