20 



The Histology and Physiology of the 



Fir,. 4. 



Thin Longitudinal Section of the Corpus Spongiosum (Man). Prepared in 

 Alcohol, and treated with Carmine. Magnified 1G0 Diameters. 



In the centre of the figure is seen a branch of the arterise profundse corporis 

 spongiosi, a, a. It is accompanied upon both sides by organic longitudinal bundles 

 of muscles, b, b, b, b, which are seen running for some distance in continuity 

 near the artery. Some of these fasciculi pass directly into the walls of the artery, 

 as at *, *, *, and are inserted in the same. Transversely-running muscular fasci- 

 culi, c, c, c, as well as those which bend from the longitudinal to the transverse 

 direction, d, d, d, d, are very distinct. Also the meshes between these fasciculi, 



g,ff- 



These arteries are accompanied by a special system of longitu- 

 dinal bundles of muscles, whose fibres become inserted at various 

 points into the middle coat of these vessels. Stilling, I believe, was 

 first to call attention to this anatomical fact. These bundles may 

 be seen in both transverse and longitudinal section (Figs. 3 and 4). 

 The number and size of these bundles vary in different sections, in 

 consequence of the changes which they undergo by the insertion 

 of their fibres into the walls of the arteries on the one hand, and 

 again by the addition of new fibres to these bundles from other 

 planes. 



The bundles accompanying the large arteries are comparatively 

 numerous, while those accompanying the smaller ones are few, and 

 not so distinct. 



