A.颈髓8个节段，胸髓12个节段，腰髓5个节段
B.颈髓7个节段，尾髓1个节段，骶髓5个节段
C.胸髓12个节段，骶髓5个节段，尾髓2个节段
D.腰髓6个节段，骶髓5个节段，尾髓1个节段
E.颈髓8个节段，骶髓6个节段，尾髓1个节段