DEVELOPMENT OF THE OVUM. 



83 



external iliac artery, below and behind by the internal iliac 

 artery, with the ureter lying on the artery ; in front by the 

 reflection of the posterior layer of the broad ligament on the side 

 of the pelvis. 



The long axis of the ovary is parallel to the ureter and is vertically 

 placed in the standing posture. The peritoneum covering the 

 triangle forms a depression, or occasionally a pouch, for the ovary. 

 It will be seen that, with the descent of the ovary, the mesosalpinx, 

 the mesovarium, and the common genital mesentery have come 

 to form the major part of the broad ligament. The reflection of" 

 the common genital mesentery from the upper or cephalic pole of 

 the ovary now forms the ovario-pelvic ligament (Figs. 59 and 61). 

 In the ovarian triangle is also situate the internal iliac group of 

 lymphatic glands, into which most of the pelvic lymphatics drain. 

 The ovarian lymphatics end in the glands of the upper lumbar 

 region near to where the ovary was developed. The ovary brings 

 down with it, too, the ovarian vessels and plexus of nerves. The 

 nerves come through the aortic plexus from the 10 th and 11th 

 dorsal segments of the cord. 



Wolffian duct. ""* " " mes oimrium 



^'•^. ^Wolffian tubule 



h— germinal epithelium 



i ouum in unripe 

 11 Graafian fol. 



primitiue ovum 

 tubular incursion of germ 

 epithelium 



Pig. 62.— Diagrammatic Section of an Ovary to show the manner in which the 

 Primitive Ova are carried in by incursions of the Germinal Epithelium. 



An Ovum. — As the infantile ovary descends, it is laden with 

 thousands of ova. Each ovum is surrounded by a capsule com- 



