MALK ORiiANS OF RKI'KODn TION 



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any such, the lumen of others being subdivided by deep ruga- inio 

 numerous anastomosing compartments. 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 numer- 

 ous alveolar dilatations and shallow divertieula. It is usually broader 





FIG. 442. PORTION OF PROSTATE GLAND OF AN OLD MAN, SHOWING THE PROSTATIC 



CONCRETIONS. 



In the upper right hand concretion the concentric lamellae are clearly discernible. 



near the blind extremity and diminishes somewhat in diameter toward 

 the duet. The caliber of the lumen also varies greatlv in different 



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tubules and is possibly dependent in part upon the state of secretory 

 activity. The contents of the lumen include the granular albuminous 

 secretion, desquamated epithelial cells, and, as age advances, many so- 

 called prostatic concretion* ('corpora amylacea' ; 'prostatic calculi'). 

 The concretions vary greatly in size (10 /A to 1 mm. in diameter), 

 and may be homogeneous, but more frequently present a distinctly 



