174 PRACTICAL HISTOLOGY [XXII 



Unstriped muscular fibres as narrow bands running 

 up the villus from the muscularis mucosse. 



@. The intestinal glands. Note that 



The epithelium consists chiefly of cubical or short 

 columnar cells; observe their gradation into the cells 

 covering the villi, usually they have a small hyaline 

 border similar to that of the columnar cells of the 

 villi. Some goblet cells will be seen ; (the number and 

 appearance of the mucous cells vary in different animals). 



There is usually a distinct basement membrane 

 immediately beneath the epithelium, formed of con- 

 nective-tissue cells very much flattened; the outlines 

 of the cells are not seen in the section, but the nuclei 

 are fairly conspicuous. 



The lumina of the glands are small, but usually 

 distinct. 



7. The thin layer of retiform tissue around the 

 bases of the glands of Lieberkiihn and between them and 

 the muscularis mucosse. This, unlike the corresponding 

 tissue in the stomach (Lesson XXI. 1, b), has a large 

 number of leucocytes in its meshes. 



. The characters of the muscular and submucous 

 coats (cp. Less. xxi. 1); the leucocytes of the follicles, 

 if follicles are present. 



. Between the two muscular coats, here and there nerve- 

 cells belonging to Auerbach's plexus. 



2. Transverse sections of the villi of the small 

 intestine of dog. (Flemming's fluid, stained in bulk in 

 hsematoxylin, cut in paraffin.) Note, comparing with 



