PENIS. 235 



collected into a thick layer, from which there proceed in the 

 region of the colliculus seminalis strands of connective tissue 

 running radially toward the capsule. The interstitial tissue 

 increases with age, while the opposite is the case with the gland 

 tubules. The hypertrophied prostates of old age are due 

 largely to increased connective-tissue growth. 



The nerves are derived from the hypogastric plexus. 

 Medullated and non-medullated fibres, with ganglion cells, are 

 present. 



Blood-vessels of the Prostate. The prostate gland derives 

 nearly all of its blood supply from the inferior and superior 

 vesical arteries. These vessels also anastomose with the internal 

 pudic. Branches of the arteries enter the connective-tissue 

 septa between the lobules, and send off fine twigs to the sub- 

 stance of the lobules. Here the capillaries are associated closely 

 with the secreting cells. This subject has been worked out 

 carefully by G. Walker, from whose results these notes have 

 been taken. 



The prostate contains the so-called utriculus prostaticus 

 (vesicula prostatica, sinus prostaticus, uterus masculinus) in the 

 form of a blind sac with its mucous membrane thrown into 

 folds. It represents the remains of the caudal end of the fused 

 ducts of Miiller, and is lined with a double-rowed ciliated 

 epithelium containing small tubular glands. 



2. Gowper's Glands. 



Cowper's glands (glandular bulbo-urethrales Cowperi) are 

 compound tubular mucous glands, the gland tubules of which 

 are lined with a single layer of cubical epithelium, and the 

 ducts with two or three layers of similar cells. 



D. The Penis. 



The main part of the penis is formed of erectile tissue, 

 which is collected into three cylindrical erectile bodies, the two 

 corpora cavernosa penis, and the corpus cavernosum urethra, or 

 corpus spongiosum. 



