FIG. 250. DIAGRAMS TO SHOW THE DEVELOPMENT 

 OF MALE AND FEMALE GENERATIVE ORGANS 

 FROM A COMMON TYPE. (Allen Thomson.) 



A. DIAGRAM OF THE PRIMITIVE UROGENITAL 



ORGANS IN THE EMBRYO PREVIOUS TO 

 SEXUAL DISTINCTION. 



3, ureter; 4, urinary bladder; 5, urachus ; 

 o, the genital ridge from which either the ovary 

 or testicle is formed ; W, left Wolffian body ; 

 w, w, right and left Wolffian ducts ; m, m, right 

 and left Miillerian ducts uniting together and 

 running with the Wolffian ducts in gc, the genital 

 cord ; ug, sinus urogenitalis ; i, lower part of 

 the intestine; cl, cloaca; cp, elevation which 

 becomes clitoris or penis ; Zs, fold of integument 

 from which the labia majora or scrotum are 

 formed. 



B. DIAGRAM OF THE FEMALE TYPE 



OF SEXUAL ORGANS. 



o, the left ovary ; >o, parovarium 

 (epoophoron of Waldeyer) ; W, scat- 

 tered remains of Wolffian tubes near 

 it (paroophoron of Waldeyer); 

 d G, remains of the left Wolffian 

 duct, such as give rise to the duct 

 of Gartner, represented by dotted 

 lines; that of the right side is 

 marked w ; /, the abdominal opening 

 of the left Fallopian tube ; u, uterus ; 

 the Fallopian tube of the right side 

 is marked m; g, round ligament, 

 corresponding to gubernaculum ; 

 i, lower part of the intestine ; 

 va, vagina ; h, situation of the hymen ; 

 C, gland of Bartholin. (Cowper's 

 gland), and immediately above it the 

 urethra; cc, corpus cavernosum 

 clitoridis ; sc, vascular bulb or corpus 

 spongiosum ; n, nympha ; I, labium ; 

 v, vulva. 



C. DIAGRAM OF THE MALE TYPE OF 



SEXUAL ORGANS. 



/, testicle in the place of its original 

 formation : e, caput epididymis ; vd, vas 

 deferens; W, scattered remains of the 

 Wolffian body, constituting the organ of 

 Giraldes, or the paradidymis of Waldeyer ; 

 vh, vas aberrans ; m, Miillerian duct, 

 the upper part of which remains as the 

 hydatid of Morgagni, the lower part, 

 represented by a dotted line descending 

 to the prostatic vesicle, constitutes the 

 occasionally existing cornu and tube of 

 the uterus masculinus ; g, the guberna- 

 culum ; vs, the vesicula seminalis ; 

 }jr, the prostate gland ; C, Cowper's gland 

 of one side ; cp, corpora cavernosa penis 

 cut short; sp, corpus spongiosum ure- 

 thrse ; s, scrotum ; t', together with the 

 dotted lines above, indicates the direction 

 in which the testicle and epididymis de- 

 scend from the abdomen into the scrotum. 



