THE ABDOMINAL WALL 



239 



tively rough and flocculent, but the inner surface is smooth 

 and glistening. 



Tunica Vaginalis. The tunica vaginalis is an invagi- 

 nated serous sac. The uninvaginated portion which lies in 

 relation with the inner surface of the internal spermatic fascia 

 is called the parietal or scrotal portion. The inner or invagi- 

 nated part is the visceral or testicular portion ; it covers the 



Skin 

 Dartos 



Ext. spermatic fascia 

 Cremasteric fascia- 

 Internal spermatic 



fascia 



Parietal tunica /- 



vaginalis 

 Tunica albuginea- 



Visceral tunica 

 vaginalis 



A lobule of the 

 testis 



A septule 

 of the testis 



Mediastinum testis 

 Sinus of the epididymis 



Testicular vein 



Epididymis 



rmis V- 



Ductus deferens N 



Artery to ductus deferens 



Internal spermatic artery 

 Internal muscular 

 tunic of Kolliker 



FIG. 105. Transverse section through the left side of the Scrotum and the 

 Left Testis, seen from above. The sac of the tunica vaginalis is repre- 

 sented in a distended condition. 



surfaces and anterior borders of the testicle and epididymis, 

 and at their posterior borders it is continuous with the 

 parietal portion. In ordinary circumstances the parietal 

 and visceral layers are separated from one another only by 

 a thin layer of fluid, which diminishes friction when the 

 layers move over one another, and the cavity of the sac is 

 merely a potential cavity ; but in some abnormal circum- 

 stances the fluid increases in quantity, the walls of the sac 



