When the nerves are injured by traction. So when trauma occurs and injures the brachial plexus, these nerves can be stretched in the middle, or they can actually be pulled free from the spinal cord itself. When a nerve is stretched in the middle of the nerve or after it leaves the spinal cord, there are several degrees of injury that can take place. There's two different classification types for this. There's the Seddon injuries, of which there is a neurapraxia, axonotmesis and neurotmesis, or they're the Sunderland classifications of injury, which are listed one through five. Our priority is the surgeons who treat these injuries is to determine which type of injury that nerve has suffered and whether it can recover on its own or will require surgery to recover the function of the limb.
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