1376 



THE URINOGENITAL ORGANS 



The dartos is closely united to the skin externally, but connected with the 

 subjacent parts by delicate areolar tissue, upon which it glides with the greatest 

 facility. 



The intercolumnar or external spermatic fascia (Fig. 1 123) is a thin membrane 

 derived from the margin of the pillars of the external abdominal ring, during 

 the descent of the testis in the fetus, which is prolonged downward around the 

 surface of the cord and testis. It is separated from the dartos by loose areolar 

 tissue, which allows of considerable movement of the latter upon it, but is intimately 

 connected with the succeeding layers. 



The cremasteric fascia (fascia cremasterica) (Figs. 1123 and 1124) consists 

 of scattered bundles of muscle fibres, the Cremaster muscle (TO. cremaster) (Figs. 

 1123 and 1124) derived from the lower border of the Internal oblique and collected 

 within a continuous covering by intermediate areolar tissue. 



Skin. 



Dartos. 



Intercolumnar fascia. " 



Cremasteric fascia. - 



Infundibuliform fascia. - 



Parietal tunica vaginalis.- 



Visceral tunica vaginalis... 



Tunica vasculosa.^_ 



Tunica albuginea. ... 



A lobule of the testicle 



Mediastinum testis. - 

 Digital fossa... 

 Spermatic vein. 

 Epididymis. 

 Vas deferens. .. 

 Artery to vas. - 

 Spermatic artery. 

 Internal muscle 

 tunic of Kdlliker. 



FIG. 1125. Transverse section through the left side of the scrotum and the left testis. The sac of the 

 tunica vaginalis is represented in a distended condition. (Dele"pine.) 



The infundibllliform fascia (tunica vaginalis communis [testis et funiculi sper- 

 matici]) (Figs. 1123 and 1124) is a thin membranous layer, which loosely invests 

 the surface of the cord. It is a continuation downward of the fascia transversal is. 

 Beneath it is a quantity of loose connective tissue which connects this layer of 

 fascia with the spermatic cord and posterior parts of the testicle. This connective 

 tissue is continuous above with the subserous areolar tissue of the abdomen. 

 These two layers, the infundibuliform fascia and the tissue beneath it; are known 

 collectively as the fascia propria. The infundibuliform fascia completely encloses 

 the testicle and epididymis and is fused with the parietal lamina of the tunica 

 vaginalis propria testis. 



The tunica vaginalis (tunica vaginalis propria testis} is described with the 

 testis (p. 1381). 



Vessels and Nerves. The arteries supplying the coverings of the testis are the superficial 

 and deep external pudic, from the femoral; the superficial perineal branch of the internal pudic; 

 and the cremasteric branch from the deep epigastric. The veins follow the course of the corre- 

 sponding arteries. The lymphatics terminate in the inguinal nodes. The nerves are the 

 ilioinguinal and genital branch of the genitofemoral nerve and of the lumbar plexus, the two 

 superficial perineal branches of the internal pudic nerve, and the inferior pudendal branch of the 

 small sciatic nerve. 



