UTERUS AND VAGINA. 



by longitudinal section of the glandulae uterinae or g. utriculares, 

 branched tubular glands. These are increased in depth during preg- 

 nancy, and are most prominent in the lower portion of the organ.) 



3. The epithelium, (a) The deeply stained layer lining the 

 vagina, cul-de-sac, and external os. (b) The wavy course of 

 a as it covers the irregularly formed and often imperfect papillae of 

 the mucosa. (c) The lighter appearance of the lining of the inter- 

 nal os. (d) Projection of the last into the glands, (e) The 

 sharp line of separation between the deeply stained lining com- 

 mon to the vagina and the lighter lining of the uterus at the ex- 

 ternal os (Fig. 92, F). 



4. The mucosa of the uterus. (There are no sharply defined 

 regions in the genito-urinary tract corresponding to the mucosa and 

 submncosa of typical mucous membranes. The arrangement gener- 

 ally is : 1, an epithelial lining; 2, a subepithelial structure, consisting 

 of a more or less prominent or abundant plexus of capillaries sup- 

 ported by delicate connective tissue, and which corresponds to the 

 mucosa of typical structures; 3, loose connective tissue, with more 

 or less muscular tissue, containing larger vessels, not separated from 

 the mucosa by any well-defined line or muscularis mucosa3, which 

 represents the submucosa; 5, the muscular walls proper, consisting of 

 layers in different directions, frequently irregularly disposed and sel- 

 dom in distinct fasciculas.) 



5. The mucosa of the vagina (less distinct than that of the 

 uterus). 



6. The uterine and vaginal walls (consisting largely of involun- 

 tary muscular fibrils, recognized by the elongate and deeply stained 

 nuclei, and containing numerous thick-walled arteries and irregular 

 lymph spaces). 



(H.) 



7. The uterine epithelium (Fig. 93). (a) That it consists of a 

 single layer of cells, (b) That the cells are columnar, not cylin- 

 drical, (c) The cells in transverse section are polygonal, (d) They 

 are ciliated. (This demonstration is not always made; but if the 

 section has been properly prepared from uninjured tissue, the cilia 

 will be seen without difficulty, and especially in the depressions where 

 they are somewhat protected.) (e) The cell body and nucleus. 

 (Note the elongate, clear, free portion and the frequent curving of 

 the whole. Near the attached extremities, which often appear 

 pointed, note the small deeply stained nuclei.) (/) The large mu- 

 cous cells. (These singular cells appear scattered between the cyl- 

 inders, with a clear bulging body, often six times the breadth of the 



