1208 



SPLANCHNOLOGY 



FIG. Ill 0. Diagrams to show the develop- 

 ment 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 dis- 

 tinction. 3. Ureter. 4. Urinary bladder. 5. 

 Urachus. cl. Cloaca, cp. Elevation which be- 

 comes clitoris or penis, i. Lower part of the 

 intestine. Is. Fold of integument from which 

 the labia majora or scrotum are formed. 

 TO, m. Right and left Mullerian ducts uniting 

 together and running with the Wolffian ducts 

 in gc, the genital cord. ot. The genital ridge 

 from which either the ovary or testis is 

 formed, ug. Sinus urogenitalis. W. Left 

 Wolffian body, w, w. Right and left Wolffian 

 ducts. 



B. Diagram of the female type of sexual 

 organs. C. Greater vestibular gland, and 

 immediately above it the urethra, cc. Corpus 

 cavernosum clitoridis. dG. Remains of the 

 left Wolffian duct, such aa give rise to the 

 duct of Gartner, represented by dotted lines; 

 that of the right side is marked w. f. The 

 abdominal opening of the left uterine tube. 

 g. Round ligament, corresponding to guber- 

 naculum. h. Situation of the hymen, f . Lower 



Eait of the intestine. I. Labium major, n. 

 abium minus, o. The left ovary, po. Epo- 

 ophoron. sc. Corpus cavernosum urethrae. u. 

 Uterus. The uterine tube of the right side 

 is marked m. v. Vulva, va. Vagina. W. 

 Scattered remains of Wolffian tubes near it 

 (paroophoron of Waldeyer). 



C. Diagram of the male type of sexual 

 organs. C. Bulbo-urethral gland of one side. 

 cp. Corpora cayernosa penis cut short, e. 

 Caput epididymis. g. The gubernaculum. 

 i. Lower part of the intestine, m. Mullerian 

 duct, the upper part of which remains as 

 the hydatid of Morgagni; the lower part, 

 represented by a dotted line descending to 

 the prostatic utricle, constitutes the occa- 

 sionally existing cornu and tube of the uterus 

 masculinus. pr. The prostate, s. Scrotum, 

 sp. Corpus cavernosum urethrae. t. Testis 

 in the place of its original formation, f, 

 together with the dotted lines above, indi- 

 cates the direction in which the testis and 

 epididymis descend from the abdomen into 

 the scrotum, vd. Ductus deferens. vh. Ductus 

 aberrans. vs. The vesicula seminalis. W. 

 Scattered remains of the Wolffian body, con- 

 stituting the organ of GiraldSs, or the para- 

 didymis of Waldeyer. 



