180 



VISCERAL ANATOMY. 



FIG. 89. 



Prostatic Sinus, 11 one on each side of 

 the veru montanum, containing the 

 orifices of the prostatic ducts. 



Sinus Pocularis, or Uterus Masculinus , 9 

 a small cul-de-sac situated at the 

 front part of the veru montanum. It 

 extends for * inch upwards and back- 

 wards into the prostate gland, beneath 

 its middle lobe. 



Orifices of the Seminal Ducts, open 

 on the margins of the sinus pocularis. 



Describe the Membranous portion 

 of the Urethra. 15 It is % inch long 

 above, and y 2 inch along its floor, being 

 that part of the canal lying between the 

 layers of the triangular ligament of the 

 perineum. Its walls are very thin, and 

 almost destitute of erectile tissue. It is 

 surrounded by the compressor urethrse mus- 

 cle, and except the orifice, is the narrowest 

 part of the urethral canal. On its sides are 

 the 



Ducts of Cowper's Glands, 1 * on their 

 way to open into the bulb of the 

 urethra. (See p. 182.) 



Describe the Spongy portion of the 

 Urethra. It is about 6 inches long, and 

 has two dilatations, one at each end, named 

 respectively the Bulb and the Fossa Na- 

 vicularis. The 



Bulb of the Urethra , 18 is the upper 

 end of the spongy portion, projects backwards for ]^ inch, and contains 

 the orifices of Cowper's glands. 

 Fossa Navicularis, is the lower dilatation of the urethra, and is situated 



within the glans penis. 

 Lacuna Magna, the largest of several orifices of mucous follicles, situated 



on the roof of the fossa navicularis. 



Glands of Littre, are numerous mucous glands and follicles, opening into 

 the urethral canal, their orifices being directed forwards. 



