212 



NORMAL HISTOLOGY. 



outer two in close contact with each other ; the two inner separated 

 by a thin layer of areolar fibrous tissue, supporting large blood- 

 vessels. This separation of the innermost layer from the middle 

 layer leads to the inference that the former is analogous to the mus- 

 cularis mucosse found in other hollow viscera, although in the uterus 

 it forms the chief mass of the muscular tissue of the organ. The 

 outer layer is made up of bundles of fibres that have a general 

 longitudinal position ; the two inner layers have a general circular 



FIG. 189. 



Transverse section of the Fallopian tube near its free end. (Orthmann.) Numerous branch- 

 ing villous projections of the wall, covered by ciliated columnar epithelium, extend into 

 the lumen. The open spaces in these villous projections are sections of the bloodvessels. 



disposition of their bundles, though the latter interlace with each 

 other in various directions within the muscularis mucosse, leaving 

 masses of areolar tissue containing the larger bloodvessels between 

 them. 



Covering the surface of the muscularis mucosse is a highly cellu- 

 lar connective tissue, not unlike granulation-tissue in appearance, 

 except that it is less richly supplied with bloodvessels. It is composed 

 of round and fusiform cells, lying in a small amount of intercellular 



