A.神經(jīng)纖維輕度損傷 B.神經(jīng)軸索和髓鞘嚴(yán)重破壞 C.神經(jīng)纖維斷裂 D.神經(jīng)髓鞘斷裂 E.神經(jīng)實(shí)質(zhì)無(wú)明顯變化