1. Bernhardt, M. (1881). Virchows Arch., 86, 363.
2. Clark, W. E. Le Gros, and Buxton, L. H. D. (1938).
3. Head, H., and Sherren, J. (1905). Brain, 28 116.
4. Weir (1872). " Injuries of Nerves and their;Mitchell, S.
5. Sharpey-Schafer, E. (1931). Proc. roy. Soc. E/i,,b.,>