Slide 153 - Kidney- You will see cuts of many small tubules here. Although the epithelium lining them shows some variability in height, notice that in general the cells are about as tall as they are wide. Nuclei are round and in the center of the cells. Notice also that some of the cells have a striated or brush border along their apical surface (toward the lumen).  This surface specialization is found in absorptive epithelia (see Slide #130).