166 THE PHYSIOLOGY OF REPRODUCTION 



This organ is enclosed within a fibrous capsule, the tunica 

 albuginea, which is very rich in lymphatics. It is covered by 

 a layer of serous epithelium reflected from the tunica vaginalis. 

 Posteriorly the capsule is prolonged into the interior of the 

 testis in the form of a mass of fibrous tissue (the mediastinum 

 testis). Certain other fibrous processes or trabeculae also pro- 



FiG. 40. Section through human testis and epididymis. (After Bohm 

 and von-Davidoff, from Schafer.) 



a, glandular substance divided into lobules by septa of connective tissue ; 

 b, tunica albuginea; c, part of epididymis; d, rete testis; e, body of 

 epididymis ; /, mediastinum ; g, sections through commencing portion 

 of vas deferens. 



ject inwards from the capsule, and divide the glandular substance 

 into lobules. The efferent ducts of the testis (vasa efferentia) 

 open into a single convoluted tube situated at the posterior 

 margin of the organ and attached to the mediastinum. This 

 is the epididymis. Its lower extremity is prolonged into a 

 thick-walled muscular tube (the vas deferens) which is the 



