770 DIRECTIONS FOB LABORATORY WORK 



the long axis of the endothelial cell to the long axis of the blood vessel? 

 How does it differ in shape from the mesothelial cell? Sketch (32) also 

 a few endothelial cells (profile view) from a stained section of a small 

 blood vessel. 



"(3) MESENCHYMAL EPITHELIUM (ranges from the cubic to the squa- 

 mous type of cell). Sketch (33) a group of the epithelial cells from a 

 stained section of the synovial membrane. (This is more generally of 

 the cubic type of epithelium.) Note membrana propria and tunica 

 propria. 



(4) Sketch (34) a few of the squamous cells (flattened entodermal 

 cells) lining the pulmonary alveoli, from a stained section of the lung; 

 also (35) a small area of the superficial cells of the skin or of the mucosa 

 of the esophagus. 



(C) COLUMNAR. 



(a) Plain. 



(1) Sketch (36) a few isolated columnar cells from a macerated 

 preparation of the mucosa of the stomach, or of the small intestine. 

 Note striated border, and position of nucleus. 



(2) Sketch (37 a) a small area of the epithelium from a stained sec- 

 tion of the stomach or small intestine. Note' proximal (basal, attached) 

 and distal (free) ends of cell, striated border and terminal bars. Note 

 terminal bars in those portions of the sections where the columnar epithe- 

 lium is cut in a tangential plane near the distal border. Sketch (37, b). 



(b) Modified. 



(1) Goblet cell. Sketch (38) several isolated goblet cells from a 

 macerated preparation of colon. 



(2) Sketch (39) small area of epithelial lining of colon, from stained 

 section. Functional tenure of a goblet cell? 



(3) Pyramidal (glandular) cell. Sketch (40) a transverse section 

 of fundus of a tubular or tubo-acinar gland (e.g., gastric, salivary), 

 showing the pyramidal shape of the glandular epithelial cell of the 

 secretory fundus or acinus. Note the lumen of the gland, and the char- 

 acter of the cytoplasm at the distal and proximal poles of the cells. 



(4) Ciliated cell. Sketch (41) several isolated ciliated cells from 

 a macerated preparation of the trachea. (These columnar ciliated cells 

 formed part of a pseudostratified columnar ciliated epithelium. See 

 below.) 



(5) Sketch (42) a portion of the epithelium of the uterus or ovi- 

 duct, from a stained section. 



