NON-MEDULLATED NERVE. 53 



due to the iiicisures. If hardened in sulpho-picric acid (15) 

 it presents a radiating structure. 



The neurilemma forms a sharp boundary to the fibre. The 

 endoneurium supplies connective tissue septa in the interfasci- 

 cular spaces of the nerve bundle, in it are found blood vessels 

 and lymph spaces. 



Osmic nerve. T.S. 48 hours in 1 P- C - osmic acid, 48 hours absolute 

 alcohol, (c. P., m. B.) 



(L) General features the same as in the last preparation. 

 (//) The medullary substance being blackened, the nerve fibres 

 appear as black rings. Observe the great difference in the 

 sizes of the nerve fibres in the same bundle. The largest are 

 chiefly motor (Gaskell), some are intermediate in size and others 

 very small (visceral?). 



Nerve. L.S. (p. 11, s. 22, c. P., m. B.) (L) The nerve fibres are 

 wavy in their arrangement inside the perineurium. (//) Single 

 out a nerve fibre which can be followed for some distance. The 

 axis cylinder is stained, so is also to a lesser degree the neuri- 

 lemma. In the space occupied by the medullary sheath funnel- 

 shaped structures are visible (Golgi's funnels). These correspond 

 to the incisures. The nodes can also be recognised. 



Non-medullated Nerve. Splenic Nerve. T.S. (p. 12, 

 s. 22 & 24, c. P., m. B.) (L) The perineurium forms a well- 

 marked envelope to the bundle of nerve fibres. The latter 

 exhibit little noticeable structure beyond small ill-defined 

 transverse sections, in which occasional nuclei are seen. 

 Scanty interfascicular connective tissue septa divide the mass, 

 in these capillaries are present. 



L.S. of the same nerve exhibits wavy fibres crowded together. 

 Each nerve fibre is nucleated and practically corresponds to an 

 axis cylinder. 



