THE DEVELOPMENT OF THE UROGENITAL SYSTEM. 



409 



tween the epithelium and the deeper parts, but is of a looser nature. (3) There 

 is a less sharp line of demarkation between the cell columns and the stroma. 

 (4) The sex cells continue to increase in size and become more conspicuous. 

 (Compare Figs. 365 and 366.) 



During these processes of development, the anlage of each genital gland be- 

 comes more or less constricted from the mesonephros and finally is attached only 

 by a thin sheet of tissue the mesovarium in the female or the mesorchium in the 



Oviduct 



(Ostium abdom- 



inale tubae) 



,-i Epoophoron 



Cortex 



* - . i \ x , 



- v 



'' ''';'.--': ' - . 4 >^pxfi"W5 i? Rete cords 



. j'^'^T'fv. (Reteovarii) 



& 



Medullary cords 

 (Medulla) 



vK- Mesonephros 



Oviduct 

 FIG. 366. Longitudinal section of the ovary of a cat embryo of 94 mm. Semidiagrammatic. Coeri. 



male (p. 423). At the same time the anlage grows more rapidly in thickness 

 than in length and assumes an oval shape. 



The Ovary. As stated above, a layer of loose connective tissue, correspond- 

 ing to the albuginea of the testicle, grows in between the surface epithelium and 

 the cell columns (sex cords) and effects a more or less complete separation. 

 The sex cords are thus pushed farther from the surface, become more clearly 

 marked off from the surrounding stroma and constitute the so-called medullary 

 cords. The cortex of the ovary at this stage is represented only by the surface 

 (germinal) epithelium, which is composed of several layers of cells and contains 



