1. Urinary System

2. A = cortex B = medulla Arrow = hilus
Kidney
A = cortex B = medulla Arrow = hilus

3. The functional unit is the nephron

5. Arrow = capsule Arrowheads = renal corpuscles

6. Comparison of proximal and distal tubules
•Proximal tubule
•Large diameter lumen
•More eosinophilic
•Lumen often stellate
•Brush boarder visible
•Fewer nuclei seen in cross section
•More abundant than D.T.
•Distal tubule
•Smaller dia. Lumen
•Less eosinophilic
•Lumen circular
•Brush boarder not visible
•More nuclei seen in cross section
•Less abundant than P.T

7. Arrowheads = proximal tubules

8. A = distal tubules

9. Ureter
Arrowhead = blood vessels Arrow = adipose tissue in adventitia

10. Double nuclei in cell of transitional epithelium

11. Arrowhead = serosa Arrow = smooth muscle
Urinary Bladder
Arrowhead = serosa Arrow = smooth muscle

12. Note highly cellular submucosa

13. Bladder in relaxed state

14. Slightly more filled bladder

15. Arrowhead = lamina propria Arrow = muscularis
Urethra
Arrowhead = lamina propria Arrow = muscularis

16. Arrow = transitional epithelium Arrowhead = lamina propria M = muscle