THE ABDOMEN 



869 



becular spaces. Such vessels are called the hdicine (spkal) arteries 

 (MiiUer). From the intertrabecular spaces the radicle veins pro- 

 ceed, and by them the blood is returned from the organ. 



Corpus Spongiosum. — This differs from the corpora cavernosa 

 in being destitute of any bony attachments. Its length is about 

 6 inches, and it is expanded at either end. It is di\'ided into a 

 bulb, bodj', and glans. The glans has been akeady described 

 (see p. 648). The bulb represents about the first i| inches of the 

 corpus spongiosum, and at its widest part it measures | inch. It 



Dorsalis Penis Vein 



Septum Pectinifonne 



Skin 



Tunica Dartos. 



Fibrous Sheath .- 

 of Penis 



Fibre-elastic Capsule 



of Corpus 



Cavemosum 



Dorsalis Penis Artery 



Dorsalis Penis Nerve 



Artery of Corpus 

 Cavemosum 



Corpus Caver- 



nosum 



__ Corpus Spongiosum 

 Urethra 



Arteries of Corpus Spongiosum 



Fig. 370. — Transverse Section of the Penis of a Child as seen 

 UNDER A Low Power. 



is surrounded by the bulbo-cavemosi muscles, and its enlarged 

 posterior extremity rests upon the front of the antero-inferior layer 

 of the triangular ligament of the urethra, where it is about i inch 

 in front of the anus. The body is cylindrical. It has a capsule 

 or tunica albuginea, but this is very thin. Within the capsule 

 there is the erectile tissue, which resembles that of the corpora 

 cavernosa, though not so well developed, and in the centre is the 

 spongy' portion of the urethra. The corpus spongiosiun is traversed 

 by the arteries of the corpus spongiosmn, right and left, which are 

 branches of the internal pudic arteries. They are situated under- 

 neath the urethral canal, one on either side of the middle line. 

 The venous blood of the corpora cavernosa and corpus spongiosum 



