222 THE POCKET ANATOMY 



inch posteriorly from the bulb projecting backwards; 

 it is contained between the layers of the triangular ligament, 

 and is surrounded by the compressor urethrae. 



(3) The spongy portion is contained in the corpus spongiosum 

 and occupies the rest of the canal, being from 4 to 6 inches 

 long ; the portion contained in the bulb is somewhat dilated, 

 and the ducts of Cowper's glands open on the floor ; the canal 

 enlarges again iust behind the meatus urinarius, which enlarge- 

 ment is named the fossa navicularis. The lumen of this part 

 of the urethra is transverse, except at the meatus (its narrowest 

 part), where it is vertical. 



The floor of the urethra is sprinkled with lacuna, which are 

 the openings of the glands of Littre ; one large one in the fossa 

 navicularis is called the lacuna magna. 



THE SCROTUM. 



The scrotum contains the testicles and spermatic cords. It 

 is divided in the middle line by a raphe ; the left half is longer 

 than the right, as the left testicle hangs down lower, the left 

 spermatic cord being longer than its fellow. 



Coverings of the Testis in the Scrotum : 



1. Skin. 



2. Superficial fascia and dartos muscle. 



3. Inter-columnar or spermatic fascia. 



4. Cremaster muscle and fascia. 



5. Infundibuliform fascia, continuous with the transversalis 

 fascia. 



6. Tunica vaginalis, consisting of a parietal and visceral 

 layer, forms a closed sac. The visceral layer invests the 

 body and epididymis of the testicle except behind, where the 

 duct and vessels are attached ; at its lateral reflection it is 

 continuous with the parietal layer. It passes, on the outer side, 

 a little between epididymis and body, forming the digital fossa. 



THE SPERMATIC CORD. 



The spermatic cord consists of the vas deferens with artery 

 to the vas, spermatic artery and pampiniform plexus of veins 

 forming spermatic vein above, sympathetic nerves, the 

 cremasteric artery, the genital branch of the genito-crural 

 nerve, lymphatics, together with some areolar tissue; it 

 extends from the internal abdominal ring to the testis, passing 

 in its course along the inguinal canal, from which it emerges 

 by the external abdominal ring, and thence in front of the 



