DISSECTING MANUAL. 



ends just behind the ureters and some distance apart, and their 

 lower ends just behind the prostate and close together. Each 

 vesicle is about two inches long and formed by a twisted tube, 

 which is four or five inches long and has many lateral diverti- 

 cula; it has thin walls like those of the ampulla; the lower end 

 tapers to a short duct which joins the vas deferens, forming the 

 common ejaculatory duct. [1164] 



Spermatic Cord. This begins at the internal abdominal 

 ring, runs through the inguinal canal, and then descends to the 

 posterior border of the testes. It consists of the vas deferens, 

 spermatic vessels, and nerves and lymphatics of the testis; 

 all these are loosely connected and covered, like an inguinal 

 hernia, by three fascial layers. These are, from without in- 

 ward ; intercolumnar fascia, derived from the External oblique 

 aponeurosis at the external ring; cremasteric fascia, derived 

 from the Internal oblique in the canal, and consisting partly of 

 muscle fibres which form loops on the testis and tunica vagi- 

 nalis ; and infundibuliform fascia, derived from the transversa- 

 lis fascia at the internal ring, with some areolar tissue from 

 the subperitoneal tissue. [1168] 



Scrotum. This pendulous bag presents externally a median 

 raphe which is prolonged backward to the anus, and forward 

 onto the penis; an incomplete septum, partly continuous with 

 the dartos tissue, divides its interior into two cavities, for the 

 testes. The wall of each cavity consists, from within outward, 

 of tunica vaginalis and of infundibuliform, cremasteric, and 

 intercolumnar fascia. Both cavities are enclosed by skin and 

 superficial fascia; in the latter is a layer of muscle fibre (Dartos 

 muscle). [1169] 



Penis. This consists chiefly of erectile tissue which is found 

 mostly in three rounded longitudinal columns, the corpus 

 spongiosum and corpora cavernosa. In the body of the penis 

 the corpora cavernosa lie side by side, one on each side of the 

 midline; they are separated on the upper (dorsal) aspect by a 

 shallow groove, and on the under (urethral) aspect by a wider 



[238] 



