Identify the following:

1. right external iliac artery

2. left external iliac artery

3. right external iliac vein

4. left external iliac vein

5. sigmoid vessels

6. superior rectal vessels

7. small bowel

8. descending colon

9. sigmoid colon

10. gluteus maximus

11. gluteus medius

12. gluteus minimus

13. piriformis