222 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 mucosae 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. 200. 



-Cilia 



**!$* r " © * fcs^ Xm-lei of 

 . S l&i** S, /ciliated cells 





Connective-tissue 



v^,- '^ <j^g, V^>crf/s of stratum 





proprium 





From a section through a fold of the mucous membrane of a human Fallopian tube. (X 480.) 



disposition of their bundles, though the latter interlace with each 

 other in various directions within the muscularis mucosa?, leaving 

 masses of areolar tissue containing the larger bloodvessels between 

 them. 



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

 lar connective tissue. It is composed of round and fusiform cells, 

 lying in a small amount of intercellular substance, in which fibres 

 can be distinguished only with difficultv. The surface of the mucous 

 membrane is covered with a layer of ciliated columnar epithelium, 

 which is continued into long tubular glands penetrating the super- 

 ficial ]>< unions of the muscularis mucosa?, where they frequently 

 branch before terminating in blind extremities. It should be borne 



