OVARY 



359 



mucosa, muscularis. and serosa (in addition to which a tela submucosa is 

 enumerated in the Basle nomenclature). The mucosa is thrown into thin 

 longitudinal folds, which are low in 

 the isthmus, but tall and branched in 

 the ampulla (Fig. 362). Occasion- 

 ally the branches anastomose, en- 

 closing a pocket, but glands are 

 absent. The epithelium is chiefly 

 simple columnar, and ciliated, the 

 stroke of the cilia being toward the 

 uterus; but there are areas of non- 

 ciliated cells which are said to produce 

 a mucoid fluid. The two types of 

 cells are connected by intermediate 

 forms. Mucous cells are absent. 



The folds of the mucous membrane are occasionally indented or over- 

 hanging, so that in transverse sections detached fragments may appear, 

 suggestive of villi (Fig. 363) ; but the fact that almost all of the many pro- 



A 



FIG. 362. THE MUCOSA OF THE UTBRINB TUBE. 

 A, Near ITS FIMBRIATED END; B., NEAR THE 

 UTERUS. (After Orthmann.) 



\ Longitudinal muscles. 



\ 

 Blood vessels. 



\ 



Circular muscles. 



Mucosa. 

 FIG. 363. CROSS SECTION; NEAR THE AMPULLA, OF A UTERINE TUBE FROM AN ADULT WOMAN. 



jections connect with the submucous layers indicates that they are elon- 

 gated folds. Each of them contains a thin layer of cellular connective 

 tissue, in which there are small arteries and veins running chiefly length- 



