A 



B 





\^ 





) : 





/ !•/■ 



• 



J 



Fig. 3. — Longitudinal section of sciatic nerve of 

 new-born dog eight days after the nerve had been 

 divided. Union had already taken place. At 

 the extremity of the central end (a) growing 

 fibres are seen running in various directions 

 towards the cicatrix (b) ; c is the peripheral end, 

 into which a few fibres are already penetrating. 

 (Marinesco.) 



A 



1 



MM 





Fig. 4. — Longitudinal section of dog's nerve, 

 twenty-one days after the nerve had been 

 divided. A more advanced condition is 

 seen than that shown in fig. 3. a is the 

 central end ; B the cicatrix of union, where 

 the nerve fibres are seen in great numbers 

 taking an irregular course. Into C, the 

 peripheral end, many fibres have already 

 successfully penetrated ; m, m', m", etc., 

 are the terminal swellings of fibres grow- 

 ing from the central stump and directed 

 towards the periphery, except in the case 

 of m", where the twisting of the new fibre 

 in its efforts to grow had, at the time when 

 the animal was killed, directed the termi- 

 nation backwards. (Marinesco.) 



