io6 



OBSTETRICAL PHYSIOLOGY. 



This arrangement ceases somewhat suddenly, by the development of a 

 transverse septum that divides the cavity into two portions : the anal 

 opening, and the urogenital orifice. At the lower end of the latter 



Fig. 48. 



Female Organs of a Fcetal Deer. 



a, Uterus ; b, b, Comua ; c, c, Oviducts ; d, d, Ovaries ; e, e, Wolffian Bodies. 



appears the genital tubercle, the rudiment of the penis or clitoris, and 

 which is surrounded by cutaneous ridges — the genital folds . This tubercle 

 increases in size, and is traversed by a groove or fissure passing from 

 behind forward. Up to this time the sexes cannot be distinguished. 



i 



Fig. 49' 

 Female Fcetus of the Cow (Natural Size). 

 I, Heart ; 2, Lungs; 3, Diaphragm; 4, Kidneys: a, Wolffian Body; 3, Germinal Gland; c. 

 Wolffian Duct ; d, Miillerian Duct ; di, Uterus and Vagina ; dii, Abdominal Opening of the 

 Oviduct ; f. Clitoris ; g^ Round Ligament of the Uterus. 



The male sex is marked by the rapid development of the genital 

 tubercle, which becomes the penis, whose extremity is enlarged to con- 

 stitute the "glans." The furrow or groove is closed behind, and forms 

 the urethra ; while the genital folds, meeting each other below the penis, 

 join to complete the scrotum. Owing to these changes, the digestive are 

 separated from the urino-genital organs, and the urethral canal is con- 

 nected with the bladder and the excretory ducts of the testicle. 



