422 



COMPARATIVE ANATOMY 



Stages of growth. That portion of the follicle which remains in the 

 ovary is converted into an endocrinal tissue the corpus luteum. If 

 the ovum is not fertilized and therefore does not become implanted in the 

 uterus, the corpus luteum soon degenerates to form a corpus albicans, 

 which eventually disappears. (Figs. 344, 345) 



Remnants of the embryonic mesonephros remain associated with 

 the ovary throughout life, as the epoophoron, paroophoron, and the 

 stalked hydatid of Morgagni. So far as is known, these are functionless 



Serosa. 



\ Longitudinal muscles. 

 ^\ Blood vessels. 

 Circular muscles. 



Mucosa. 

 Fig. 346. — Cross section, near the ampulla, of a uterine tube from an adult woman. 

 (From Bremer's "Text Book of Histology.") 



rudiments of organs functional in lower vertebrates. Ovarian arteries 

 and veins enter the ovary besides a branch of the uterine artery. The 

 nervous supply is sympathetic. In addition to the reproductive function, 

 it is generally assumed that the ovaries serve as endocrinal organs which 

 in ontogenesis determine the secondary sexual characters of the female. 



Uterine Tubes. The uterine tubes, which convey the ova to the 

 uterus, vary in length from three to five inches. Near the uterus each 

 tube is straight, but as it approaches the ovary it becomes sinuous and 

 enlarged in diameter. The termination of each tube is a funnel-shaped 

 structure, the infundibulum, which opens into the body cavity and 



