210 NORMAL HISTOLOGY. 



develop from the fibrous wall, replacing the clot and eventually 

 producing a scar. This process is much more rapid in case the 

 ovum is not impregnated (corpus hsemorrhagicum) than when im- 

 pregnation has taken place. In the latter case the productive 

 inflammation is more marked, and is accompanied by a fatty 

 degeneration of the older granulations Avhich gives them a yel- 

 lowish tinge (corpus luteum). In the centre of this yellowish zone 

 is the remainder of the clot, and about its periphery an envelope of 

 fibrous tissue, which is usually irregular in contour. The corpus 

 luteum finally becomes a mass of cicatricial tissue of greater size 

 than that resulting from a corpus haBmorrhagicum (corpus album) 

 (Figs. 187 and 188). 



FIG. 187. 



- 



^'f.^vAvS^oS**^** -A 



?^&&\V' *'*' 





x ' ke 



"-,-,: ; 



f 



thi e 



Section from rabbit's ovary, illustrating the formation of the corpus luteum. (Sobotta.) 

 Recently ruptured Graafian follicle, ke, germinal epithelium; beneath it, the ovarian 

 stroma. Bounding the follicle externally is the fibrous capsule of the follicle. Within 

 this, thi, is a layer of proliferating fibrous tissue, composed of polyhedral cells with round 

 nuclei. Among these are elongated nuclei belonging to endothelial cells springing from 

 the capillaries, and destined to form the walls of future bloodvessels ; e, epithelium of 

 the membrana granulosa. Within this are the viscid remains of the liquor folliculi, 

 containing a few red blood-corpuscles and some epithelial cells detached from the mem- 

 brana granulosa, bl, red blood-corpuscles. This section was prepared from an ovary 

 about twenty-four hours after coitus, and the development of the layer thi probably 

 took place within that time. 



2. The Fallopian Tube. The free surface of the Fallopian tube 

 is covered by a serous membrane, continuous with the rest of the 

 peritoneum. This rests upon fibrous tissue, in which the longi- 

 tudinal bundles of smooth muscular tissue constituting the external 



