494 



THE EEPBODUCTIVE SYSTEM 



the lumen of the duet is very narrow, especially when compared with 

 its exceptionally thick muscular wall. As in other portions of the 

 excretory canal of the testicle, the lumen of the duetus deferens con- 

 tains many spermatozoa. 



THE SPERMATIC CORD. The spermatic cord in its scrotal portion, 



':^-&^*: : - 



"-i'-i.*-^--Jr- 



ggte 



: ^I^e^t 



'3S < * 5l ^*-Sj^if'i^?r % i^j';:-i5 



' ^^ T 



FIG. 438. TRANSECTION OF THE DUCTUS DEFERENS OF A DOG. 

 Hematein and eosin. Photo. X 104. 



in addition to the duetus deferens, contains a mass of connective tissue 

 in which are embedded the smooth muscle fibers of the internal cre- 

 master muscle, the spermatic artery, veins, and nerve plexus, and the 

 vessels of the panipinif'orm plexus. The whole is invested by a reflection 

 of the tunica va.n'inalis. 



The pampiniform /ilc.nifi is a considerable group of venous spaces, 

 usually completely collapsed after death, which are characterized by 



