THE DEVELOPMENT OF THE UROGENITAL SYSTEM. 109 
forming the Miillerian duct by the process of cleavage and 
separation referred to on preceding page. 
Fie. sc gt et ay representation of He pera organs of a human embryo previous to 
sexual distinction (Allen Thomson), W, Wolffian body; ge, genital cord; m, Miillerian 
duct; W, Wolffian duct; ug, urogenital sinus: cp, clitoris or penis; 7, intestine; cl, 
cloaca ; ls, part from which the scrotum or labia majora are developed ; of, origin of the 
ovary or testicle respectively ; x, part of the Wolffian body developed later into the coni 
vasculosi ; 3, ureter ; 4, bladder ; 5, urachus. 
The future of the Millerian and Wolffian ducts varies ac- 
cording to the sex of the embryo. 
Fig. 128.—Diagram of the mammalian type of male sexual organs (after Quain). Compare 
with Figs. 127,129. C, pil eat gland of one side ; cp, corpora cavernosa penis, cut short ; 
e, caput epididymis ve gu bernaculum ; 7, rectum ; m, hydatid of Morgagni, the persistent 
anterior end of the Miullerian duct, the conjoint posterior ends of which form the uterus 
masculinus ; pr, prostate gland; s, scrotum ; Bs corpus peongioeats urethre ; t, testis 
(testicle) in the place of its original formation. ‘The dotted line indicates the direction in 
which the testis and epididymis change place in their descent from the abdomen into the 
scrotum ; vd, vas deferens; vh, vas aberrans; vs, vesicula seminalis; W, remnants of 
Wolffian body (the organ of Giraldés or paradidymis of Waldeyer) ; 3, 4, 5, as in Fig. 129. 
