THE REPRODUCTIVE ORGANS. 



223 



FIG. 197. 



open into the intertrabecular spaces, discharging blood into those 

 enormously dilated venous radicles. Here 

 and there arterial twigs, surrounded by an 

 investment of fibrous tissue, project from the 

 trabeculae into the venous spaces. These, 

 because of their twisted forms, have received 

 the name helicine arteries (Figs. 197 and 198). 

 The structure of the corpus spongiosum is 



FIG. 198. 



Fig. 197. Section of injected corpus cavernosum. (Henle.) a, fibrous capsule ; 6, trabeculse ; 



c, section of the arteria profunda penis. All the spaces are filled with the material used 



for injection. 

 Fig. 198. Helicine arteries. A, B, C, from the corpus cavernosum; D, from the corpus 



spongiosum ; * *, fibrous bands forming a part of the trabecular network. 



similiar to that of the corpora cavernosa, but the trabeculse are 

 more delicate and the spaces between them of more uniform size. 

 Its sheath is studded with papillae where it covers the glans, at the 

 edge of which they are unusually large. They are covered with a 

 layer of stratified epithelium, which conceals them over the surface 

 of the glans, where they are comparatively small, but merely invests 

 the larger ones at the corona. This layer of epithelium is continu- 

 ous with that of the skin covering the rest of the penis, which is 

 elsewhere loosely connected with the underlying structures by 



