528 



DISSECTION OF THE PELVIS. 



urethra, and is named sinus of the bulb ; the other is an elongated hollow, 

 situate in the glans penis, which has been called fossa navicularis (?z) 

 from its shape. 



Fig. 181. 



a. Triangular surface of the blad-' 



der. 

 6. Openings of the ureters. 



c. Prostate, cut. 



d. Caput gallinaginis. 



e. Sinus pocularis. 



f. Prostatic sinus, with openings 



of the glands of the prostate. 



g. Membranous part of the ure- 



thra. 



ft. Cowper's glands, a duct from 

 each opening into the urethra. 



i. Spongy part of the urethra. 



A. Bulb of the urethra. 



1. Glans penis, and n, fossa navi- 

 cularis. 



o. Openings of lacuna; and glands. 



r. Corpus cavernosum of the penis. 



VIEW OF THE LOWER PART OP THE BLADDER AND OF THE URETHRA LAID OPEN. 



There are many small pouches or lacunae (o) in the canal, as far back 

 as the membranous part, which have their apertures turned towards the 

 outer orifice of the urethra. One of these, larger than the rest, lacuna 

 magna, is placed, generally, on the upper boundary or roof of the urethra, 

 opposite the fossa navicularis. 



The ducts of Cowper's glands (fig. 181, h) are two in number, and 



