390 



THE MALE REPRODUCTIVE ORGANS 



The prominence of the folds varies greatly in different tubules, 

 some showing scarcely any such, the lumen of others being sub- 

 divided by deep rugae into numerous anastomosing compartments. 



FIG. 316. SEVERAL ALVEOLI or THE HUMAN PROSTATE GLAND, SEEN IN SECTION. 

 Hematein and eosin. Photo, x 160. 



The amount of the folding also varies in different species, being 

 more highly developed in some of the lower mammals, e. g., the 

 dog, than in man. 



The lumen of the prostatic tubules is broad, and is beset with 

 numerous alveolar dilatations and shallow diverticula. It is usu- 

 ally broader near the blind extremity and diminishes somewhat in 

 diameter toward the duct. The caliber of the lumen also varies 

 greatly in different tubules and is possibly dependent in part upon 

 the state of secretory activity. The contents of the lumen include 



