738 HUBER. 



EXPLANATION OF PLATE XXXV. 



Fig. io. Teased preparation from implanted segment thirty-nine days after 

 implantation, taken just below cross-section as shown in Fig. 9. Miiller's fluid 

 hardening. Stroebe's stain. Leitz ^\ in., oil immersion, ocular No. 3. a, old 

 sheaths ; b, new fibres with delicate axis cylinder stained deeply blue, surrounded 

 by small amount of protoplasm. 



Fig. II. Teased preparation from peripheral ulnar just below peripheral wound 

 thirty-nine days after cutting nerve. Miiller's fluid hardening. Stroebe's stain. 

 Leitz yV in., oil immersion, ocular No. 3. a, nerve fibres with axis cylinder ; 

 b, old sheaths ; c, old sheath containing a number of balls of myelin. 



Fig. 12. From teased preparation of peripheral end of central ulnar, one 

 hundred and seventeen days after implantation. Miiller's fluid hardening. 

 Stroebe's stain. Leitz y^^ i"^-) ^^ immersion, ocular No. 3. (C) central end; 

 {P) peripheral end of fibre as shown in figure, a, old axis cylinder from which 

 bud three young axis cylinders ; b, one of which becomes the axis cylinder of a 

 regenerated fibre at ^ ; d, node of Ranvier. 



Fig. 13. Longitudinal section through central wound (connective tissue between 

 stump of central ulnar and central end of implanted segment) one hundred and 

 seventeen days after implantation. Miiller's fluid hardening. Stroebe's stain. 

 Leitz -^^ in., oil immersion, ocular No. 3. Coursing through the interlacing 

 fibrous connective tissue (a) are seen a number of small nerve bundles, some of 

 which have quite a regular course ((5), others a serpentine course, winding their 

 way through the connective tissue (c); d, a small bundle in cross-section. Some 

 of the nerve fibres are medullated ; e, small blood vessels. 



Fig. 14. Longitudinal section of peripheral wound (connective tissue between 

 stump of ulnar and peripheral end of implanted segment) of dog one hundred 

 and seventeen days after implantation. Miiller's fluid hardening. Stroebe's stain. 

 Leitz y'2 in-' oil immersion, ocular No. 3. C, central-ward ; P, peripheral-ward. 

 b, nerve fibres passing quite regularly through connective tissue ; c, a bundle of 

 nerve fibres evidently deflected in their course by the firmly organized mass of 

 fibrous connective tissue at a. 



Fig. 15. Three fibres from teased preparation made from small muscular 

 branch passing to flex. carp. ul. Miiller's fluid hardening. Stroebe's stain. 

 Leitz y^j in., oil immersion, ocular No. 3. A, nerve fibre showing down-growing 

 axis cylinder (1^) ending in bulbous enlargement (c) ; young fibre contained in old 

 sheath (j); n, s, new sheath; «, m, newly developed myelin. B, showing a. 

 similar condition except that peripheral end of down-growing axis cylinder has a 

 wavy course; b, axis cylinder; s, old sheath; «, m, newly developed medullary 

 sheath. C, new nerve fibre with axis cylinder passing down between the old 

 sheaths. 



Fig. 16. Teased preparation from peripheral ulnar at wrist one hundred and 

 seventeen days after cutting the nerve. The figure shows a number of typical 

 fibres in different stages of degeneration and regeneration. Miiller's fluid 

 hardening. Stroebe's stain. Leitz y^j in., oil immersion, ocular No. 3. A, 

 completely degenerated fibre, no regeneration ; B, degenerated fibre containing 

 balls of broken-down myelin ; C, new fibre with axis cylinder and a number of 

 nerve corpuscles ; D, axis cylinder in old degenerated fibre ; a, two small fragments 

 of myelin ; E, fibre showing down-growing axis cylinder ending in slight enlarge- 

 ment at a ; b, continuation of old sheath free from axis cylinders containing a 

 small amount of protoplasm and two nerve corpuscles. 



