50 THE STRUCTURE OF THE GLANDS OF BRUNNER 



PLATE XXII 



FIG. 9. Tubule of the glands of Brunner of the muskrat. Composed of large mucous 

 cells with flattened nuclei. Transverse band of cytoplasm separating the contained secretion 

 into two masses is readily visible. X 720. 



FIG. 10. Portions of three pyloric glands of the muskrat. Note the smaller cells, larger 

 nuclei, and more abundant cytoplasm as compared with Fig. 9. X 720. 



FIG. 11. A small lobule from the glands of Bruuuer of man. X 190. 



FIG. 12. A portion of a lobule of the glands of Brunner of man located in the tunica 

 mucosa. The duct of the gland opens into a gland of Lieberklihn, where a sudden change 

 in character of the cells takes place. The cells of the duct become richer in secretion the farther 

 they are from the point of entrance into the intestinal gland, the nuclei at the same time becom- 

 ing more flattened. In many of the cells may be seen the transverse band of cytoplasm 

 separating the secretion into two masses. X 280. 



PLATE XXIII 



FIG. 13. Section of the duodenum of man. The superficial epithelium and portions of the 

 villi in this section were unfortunately lost. The grouping of the glands of Brunner in the 

 tunica mucosa and tela submucosa are shown, as well as their opening into the glaudulae intes- 

 tinales. X 66. 



PLATE XXIV 



FIGS. 14, 15. Photomicrographs of section of the duodenum of man stained in stronger 

 muchsematein. These figures show well the topography of the glandular lobules as well as 

 the intensity of the stain which their contained mucin takes in this solution. X 37. 



326 



