The cells of the anal canal change as they go from the rectum to the anal verge: >Cells above the anal canal (in the rectum) and in the part of the anal canal close to the rectum are shaped like tiny columns. 
The cells of the anal canal change as they go from the rectum to the anal verge: >Cells above the anal canal (in the rectum) and in the part of the anal canal close to the rectum are shaped like tiny columns. 