250 



MICROSCOPIC ANATOMY OF Till-: (HIGANS. 



B. Fallopian Tube (Tuba Uterina Fallopii). 



In the walls of this tube we can distinguish the following 

 coats : mucosa, submucosa, muscularis, and serosa. 



The tunica mucosa is thrown into many longitudinal folds, 

 varying somewhat in different parts of the tube. In the 

 ampulla they are highest and possess numerous branched 

 accessory folds, so that the lumen seems filled with them 

 (Fig. 187). There are, however, throughout the tube only 

 four main folds, as can be seen more plainly in a tube taken 



FIG. 187. 



Blood-vessel 



Lumen of tube 



lilx of nitn'osn 



of the 



mucosa 



Transverse section through the ampulla of the Fallopian tube of a young woman. X 25. 



from an embryo or newborn babe. The mucous membrane is 

 covered on the surface with a single layer of columnar ciliated 

 cells, the movement of whose cilia is toward the uterus 

 (Fig. 188). The tunica propria is rich in cells and overlies a 

 thin muscularis mucosse composed of longitudinal smooth muscle 

 fibres. The tunica submucosa consists of loose connective tissue, 

 and is bounded on the outside by two layers of smooth muscle, 

 making up the tunica muscularis. The fibres of the inner 

 stronger layer run circularly, while the outer thin layer is longi- 

 tudinal. The muscle lavers are thicker near the uterus than at 



