576 



ABDOMEN 



utriculus prostaticus. Its orifice is narrow, but the recess 

 widens out towards its blind upper end, and its length, which 

 may be gauged with a probe, varies from a quarter to half an 

 inch (6-12 mm.). It is of interest both practically and 

 developmentally, practically, because it is sometimes large 

 enough to entangle the point of a small catheter or bougie, 

 and developmentally, because it represents, in the male, the 

 vagina and uterus of the female. 



Ureter 



Ductus deferens -- 



Vesicula 

 seminalis' 



Middle lobe 

 of prostate 



Utriculus prosta- 

 ticus and 



ejaculatory duct 



Bulbo-urethral 



gland (Cowper's) 



Bulb of corpus 



cavernosum 



urethrae 



Urachus 



Bladder 



Prostate 



Corpus 



cavernosum 



penis 



" Glans penis 



FIG. 226. Diagram of the Bladder, Urethra, and Penis. (Dle"pine.) 



On the margins of the prostatic utricle the dissector will 

 find the slit -like orifices of the ejaculatory ducts. The 

 ducts themselves run downwards, along the lateral walls of 

 the utricle, between the middle and lateral lobes of the 

 prostate. Bristles should be passed through the apertures 

 into the ducts. 



Owing to the projection of the urethral crest from the 

 middle of the floor of the canal a transverse section of the 

 prostatic portion of the urethra presents a crescentic figure 

 the convexity of the crescent being directed forwards and 

 the concavity backwards. 



