DISTRIBUTION OF NERVES TO ARTERIES OF MAMMALIA. 305 



an adjacent vessel, while the other was distributed to 

 the elementary fibres of the muscle. In my paper 

 " On the Structure of the Papillae of the Frog's 

 Tongue " these statements have been confirmed ; 

 and in some of my specimens, nerves distributed to 

 arteries and to elementary muscular fibres of striped 

 musle are seen to be derived from the same trunk of 

 dark-bordered nerve-fibres. Croonian Lecture, Pro- 

 ceedings of the Royal Society, May, 1865. 



304. Distribution of nerves to arteries of mam- 

 malia. With regard to the distribution of nerves to 

 the organic muscle of mammalia, I have to observe 

 that the extreme delicacy and translucency of the 

 fibres renders demonstration most difficult. I have, 

 however, succeeded in tracing very delicate fibres 

 from ganglia, situated between the muscular and 

 mucous coat of the small intestine of the white mouse 

 to their distribution amongst the muscular fibre-cells. 

 Still more recently, I have been able to follow nerve- 

 fibres to the small arteries, as well as to the capillaries 

 (page 313) of the bat's wing. 



In order to successfully demonstrate the distribu- 

 tion of fine nerve-fibres, it is necessary to have ex- 

 cessively thin specimens in which the relations of the 

 various tissues to one another have not been disturbed 

 by the fraying out and pressure to which the section 

 must needs have been subjected. 



305. Distribution of nerves to veins. Nerves 

 ramify in the external areolar coat of the veins as in 

 that of the arteries. The thin muscular coat of some 

 of the smaller veins is abundantly supplied with fine 

 nerves, which ramify upon and amongst the muscular 

 fibres, and, at least in some instances, even in greater 

 number than upon arteries. I have also detected 

 nerve-fibres just outside the smallest veins, arranged 

 in much the same manner as those distributed to the 

 capillary vessels. In the bat's wing I have succeeded 

 in demonstrating these fibres very distinctly. As the 



