314 NORMAL HISTOLOGY AND ORGANOGRAPHY. 



tremity. The isthmus is smooth and round, about 

 one inch in length, and opens into the fundus of the 

 uterus by a small orifice that will barely admit an 

 ordinary bristle. It is a straight and narrow part of 

 the duct, about 2 to 3 mm. in diameter. The am- 

 pulla encircles the ovary and is at least twice the size 

 of the isthmus. It is also less firm to the touch, 



Longitudinal 

 muscle. 



Ciliated ^ 

 epithelium 



Fig. 228. Cross section of ampulla of Fallopian tube. 



being flabby while the isthmus is cord-like. The 

 neck is an annular constriction between the ampulla 

 and fimbriated extremity, the latter being a' funnel- 

 shaped expansion of the ovarian end of the tube, 

 which terminates in a number of irregular processes 

 called fimbrice. The fimbriae vary considerably in 

 size and number. Many of them are branched, and 



