372 



THE ORGANS 



its development remove an ovary from an adult cat or dog and treat as above. 



Technic (i). These sections also, as a rule, are satisfactory for the study of the 



corpus luteum. 



(3) The adult human ovary is little used for histological purposes on account 



of the few follicles it usually contains and its proneness to pathological changes. 



Its study is, however, so extremely important, especially 

 with reference to the pathology of the ovary, that if possi- 

 ble a normal human ovary should be obtained from a 

 3'oung subject for purposes of comparison with the above. 

 Technic (i). 



(4) For studying the egg cords of Wliiger and their 

 relation to the germ epithelium, ovaries of the human 

 foetus, and of very young cats, dogs, and rabbits are satis- 

 factory. Technic (i). 



(5) Sections of the fimbriated end of the oviduct 

 are usually found in the sections of ovar>\ For the study of 

 other parts of the tube, cut out thin pieces from different 

 regions, fix in formahn-MuIler's fluid, stain transverse sec- 

 tions with haematoxyhn-eosin, and mount in balsam. 



The Uterus 



The wall of the uterus consists of three coats 

 which from without inward are serous, muscular, 

 and mucous. 



The serous coat is a reflection of the peritoneum, 

 and has the usual structure of a serous membrane. 

 The mtiscularis consists of bundles of smooth 

 muscle cells separated by connective tissue. The 

 muscle has a general arrangement into three 

 layers, an inner, a middle, and an outer, which are 

 distinct in the cervix, but not well defined in the 

 body and fundus. 



The inner layer — stratum suhmucosum — is 

 mainly longitudinal, although some obliquely 

 running bundles are usually present. 



The middle layer — called from the large venous 



channels which it contains, the stratum vasculare 



— is the thickest of the three layers, forming the 



main bulk of the muscular wall. It consists mainly of circularly 



disposed muscle bundles. 



The outer layer — stratum supravasculare — is thin and consists 

 partly of circular bundles, partly of longitudinal. The latter pre- 

 dominate and form a fairly distinct layer just beneath the se'rosa. 



Fig. 264. — Muscle 

 cells from (a) non- 

 pregnant uterus; h, 

 pregnant uterus; 

 drawn to same scale. 

 (Sellheim.) 



