1904 



HUMAN ANATOMY. 



parietal layer of the tunica vaginalis and the infundibuliform fascia, extending upward 

 into the spermatic cord. 



Vessels. — The arteries supplying the scrotum, — as distinguished from those des- 

 tined for the spermatic cord and the sexual gland and associated structures, — although 

 of small size, are derived from different sources. Those distributed to the front and 

 sides are the anterior scrotal branches from the deep external pudics, supplemented 

 above by twigs from the superficial external pudics. The back of the scrotum and the 

 septum are supplied by the posterior scrotal arteries, superficial branches from the 

 internal pudics. Free communication exists not only between the vessels of the two 

 sides across the mid-line, but also between the anterior and posterior branches at the 

 sides. The scrotal arteries anastomose with twigs from the obturator and internal 

 circumflex, as well as with those from the cremasteric artery. 



The veins, numerous and plexiform in arrangement, form trunks that follow the 

 general course of the chief arteries, becoming tributary to the external saphenous or 

 the femoral and the internal pudic veins. They anastomose freely with the adjoining 

 venous paths of the penis, perineum, and pubic region. 



Fig. 7672. 



Veins 



Blood-vessels 



- . -».:^^'^ x^^'Mi^ - Ji*-"^^'^* deferens 



3^i^«^ .'• ^^ 'l«i''»ii>'^ii»<''\s __^5?^Spermatic veins 



..v\,-'-- 



Sac of tunica vaginalis 



Tunica vaginalis 



Spermatic arteries 



Mediastinum testis 



isceral tunica vaginalis 



Parietal tunica vaginalis 



Lobules of left testis 



Cremasteric fascia 



Skin and dartos 



I Septum of scrotum 



Obliquely cut vas deferens 



Section across formalin-hardened scrotum, showing lower end of spermatic cords and testes in section. 



The lymphatics of the scrotum are very numerous and form a superior and an 

 inferior group of vessels, all of which lead to the median group of superficial inguinal 

 lymph-nodes. Frequent communications occur with those of the penis and perineum, 

 but only sparinglv with the deep lymph-tracts within the spermatic cords. 



The nerves supplying the scrotum are derived from both the lumbar and sacral 

 plexuses. Those from the former source are distributed to the front and sides of the 

 scrotum and include cutaneous twigs from the genital branch of the genito-crural 

 nerve, usually reinforced by twigs from the ilio-inguinal that end in the integument in 

 the vicinity of the root of the scrotum. Those from the sacral plexus supply the 

 posterior surface of the scrotum and are from the perineal or inferior pudendal 

 branches of the small sciatic nerves and the anterior or external superficial perineal 

 branches of the pudic nerves. Sympathetic fibres accompany the cutaneous nerves 

 for the dartos muscle. 



PRACTICAL CONSIDERATIONS : THE SCROTUM. 



The scrotum, from a practical stand-point, may be studied as if composed of 

 two layers, an external, made up of the skin and dartos, and an internal, consisting 

 of the three coverings — fascial, muscular, and aponeurotic — derived from the abdomi- 

 nal wall, the infundibuliform, cremasteric, and intercolumnar. 



As the testes are safer from injury in a loose pouch, in which they can readily 

 glide away from threatened trauma, the scrotum is' redundant (more so on the left 



