TISSUES. 51 



(6) Simple cuboidal, found forming the wall of 

 small ducts, portions of the kidney tubules, and the 

 vesicles of the thyroid gland. 



(c) Simple columnar, ciliated or non-ciliated. 



Fig. 1 6. Squamous epithelial cells from the mouth. 



This is the most common form of simple epithelium. 

 The alimentary canal, below the diaphragm, has 

 simple columnar; also portions of the kidney tubules. 



Murcits. 



Goblet cell. 



Fig. 17. Simple columnar cells from intestine. 



Simple ciliated is found in the oviduct, uterus, cen- 

 tral canal of the spinal cord, and smaller bronchi. 



(d) Pseudo-stratified.ln this type all the cells 

 rest on a common basement membrane, but the 

 nuclei rest at different levels, which give the tissue 

 the appearance of being stratified. Frequently 

 this tissue is ciliated, as is the case in portions of the 

 respiratory tract. 



