1. The Urinary System
Part 1- Rat Dissection

2. Pre-lab Prepare the dissection tray and equipment. Put on your gloves.
Retrieve your rat from the tray in your cabinet.
Remove the skin from around your rat and place the skin back in the zip-lock bag.
Lay the rat in the dissection tray ventral side up.
If you have not removed the digestive organs from the abdominal cavity do so at this time.
Carefully remove any fat in the lower pelvic region.

3. Kidneys

4. Adrenal Gland

5. Blood Vessels 9
This rat was injected with colored latex to help students view the structures of the circulatory system.
Recall that red symbolizes oxygenated blood and blue symbolizes deoxygenated blood. 10

6. Blood Vessels 11 12

7. Ureters

8. Bladder

9. Bladder

10. Carefully remove one kidney from your rat
Carefully remove one kidney from your rat. Save it for a comparison to the sheep kidney.

11. Part 2
Sheep Kidney

12. Obtain a preserved sheep kidney and rinse it with water to remove as much of the preserving fluid as possible.

13. Renal Capsule

14. Hilum

15. Ureter

16. Renal Blood Vessel

17. Dissecting the kidney
Using the knife on the cutting board, carefully cut the sheep kidney in half longitudinally along the frontal plane, beginning on the convex border.
Using a razor blade cut the rat kidney in half along the same plane.
Rinse the interior of the kidney with water.

18. Renal Cortex and Renal Medulla

19. Renal Pyramid

20. To see the next three structures, remove the renal medulla from the kidney.

21. Minor Calyx

22. Major Calyx

23. Renal Pelvis

24. This rat has prostate cancer!

25. Throw the organs removed from your rat in the garbage.
Spray your rat with preservative.
Put the skin back on the rat and spray it again.
Place the rat in your bag and keep it in your cabinet.