THE ORGANS OF THE MIDDLE GEEM-LAYEE. 



389 



■an epithelial cord. Gassbe indeed observed a rudimentary canal of 

 considerable extent at the side of the vas deferens in a recently born 

 male child. Certain 

 rudiments of the ter- 

 minal portions, on 

 the contrary, are pre- 

 served even in the 

 adult individual, and 

 in descriptive anato- 

 mies are called uterus 

 m,asculinus {um) and 

 non-stalked hydatids 

 of the epididymis {hy). 

 The posterior ter- 

 minal parts of the 

 two MuUerian ducts, 

 which lie close to- 

 gether enclosed in 

 the genital cord, are 

 modified into the 

 niterus mascuKnus 

 ium). Owing to the 

 <iisappearance of the 

 partition separating 

 them, they are united 

 into a single small 

 sac, which is situated 

 between the openings 

 of the two vasa de- 

 ferentia at the pro- 

 stata and therefore 

 still bears the name 

 •of sinus prostaticus. 

 Extraordinarily in- 

 ■conspicuous in Man, 

 it acquires in many 

 Mammals, in Carni- 

 vores and Ruminants 



Fig. 223,— Diagriun to illustrate the development of the male 

 sexual organs of a Mammal from the indifferent funda- 

 ment of the urogenital system, which is diagrammatically 

 represented in fig. 219. 



The persistent parts of the original fundament are indicated 

 by continuous lines, the parts which undergo degeneration 

 by dotted lines. Dotted lines are also employed to show 

 the position which the male sexual organs take after the 

 completion of the descensus testiculorum. 



7i, Kidney ; h, testis ; n/t, epididymis ; pa, paradidymis ; Iiy, 

 hydatid of the epididymis ; si, vas deferens ; mg, degenerated 

 Miillerian duct ; um, uterus masculinus, remnant of the 

 HiiUerian ducts ; gh, gubernaculum Hunteri ; hi, ureter ; 

 JiV, its opening into the bladder ; sbl, vesiculse seminales ; 

 hil, urinary bladder ; liW, its upper tip, which is continuous 

 with the ligamentum -vesico-umbUicale medium (ui'achus) ; 

 hr, urethra ; pr, prostata ; dej, external orifice of the ductus 

 ejaculatorii. 



The letters nh', h', sV indicate the position of the several organs 

 after the descent has taken place. 



(Webbe), a considerable size, and is differtotiated, as in the female, 

 into a vaginal and a uterine part. In Man it corresponds chiefly 

 to the vagina (Tourneux). 



