THE EXTERNAL ORGANS. 



131 



Fig. 156. DIAGRAMS TO sno\v THE DEVELOPMENT 



OF MALE AND FEMALE GENERATIVE ORGANS 



FROM A COMMON TYPE. (Allen Thomson. ) 

 A. DIAGRAM OF THE PRIMITIVE URO-GENITAL 



ORGANS IN THE EMBRYO PREVIOUS TO SEXUAL 

 DISTINCTION. 



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

 ot, the genital ridge from which either the ovary 

 or testicle is formed ; W, left Wolffian body ; 

 10.10, right and left Wolffian ducts ; m.m, right 

 and left Miillerian ducts uniting together and 

 running with the Wolffian ducts in c/c, the genital 

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

 the intestine ; d, cloaca ; cp, elevation which 

 becomes clitoris or penis ; Is, 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 ; po, 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 Fallo- 

 pian 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 ; A, situation, 

 of the hymen ; C, gland of Bartholin 

 (Cowper's gland), and immediately 

 above it the urethra ; cc, corpus ca- 

 vernosum clitoridis ; sc f vascular bulb 

 or corpus spongiosum ; n, nympha ; 

 I, labiuin ; v, vulva. 



C. DIAGRAM OF THE MALE TYPE OF 



SEXUAL ORGANS. 



t, 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 clotted 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 ; pr, 

 the prostate gland ; (7, 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. 



K 2 



