The rectum is a 12 cm long straight tube in quadrupeds that bends at the ano-rectal junction in humans due to the pubo-rectal sling muscle. It has anterior, posterior, and lateral relations within the pelvic cavity and receives nerve supply from pelvic splanchnic nerves and arteries from the inferior mesenteric artery. It is supported by structures like the pubo-rectal sling, pelvic fascia, and ischio-rectal fat pad.

1. RECTUM

3. INTRODUCTION
 RECTUM – STRAIGHT TUBE
 IN QUADRUPEDS – STRAIGHT
 IN MAN – IT IS BEND AT ANO-RECTAL
JUNCTION BY THE PULL OF THE PUBO-
RECTAL SLING OF LEVATOR ANI MUSCLE
 IT IS DEVOID OF TAENIA COLI,
SACCULATIONS, APPENDICES EPIPLOICAE
AND MESENTRY.
 SITUATION- IN PELVIC CAVITY.

7. COURSE

9. MEASUREMENTS
• LENGTH- 12 cm (5 inches)
• BREADTH- upper part is 4 cm, lower part foms
a dilatations is known as AMPULLA.

10. CURVATURES OR FLEXURES OF
THE RECTUM
ANTERO- POSTERIOR CURVES
LATERAL CURVES
ANTERO- POSTERIOR CURVE
A.) SACRAL CURVE
B.) PERINEAL CURVE

11. ANTERO- POSTERIOR CURVES

12. LATERAL CURVES
They are 3 in number
UPPER CURVE
MIDDLE CURVE
LOWER CURVE

14. RELATIONS

15. PERITONEAL RELATIONS OF
RECTUM

17. GENERAL
RELATIONS OF THE
RECTUM

18. ANTERIOR RELATIONS IN
MALES

19. ANTERIOR RELATIONS IN
MALES

20. ANTERIOR RELATIONS IN
FEMALES

21. POSTERIOR RELATIONS

23. LATERAL RELATIONS

25. INTERIOR OF THE RECTUM

27. NERVE SUPPLY

30. ARTERIAL SUPPLY

31. VENOUS DRAINAGE

32. LYMPHATIC
DRAINAGE

33. SUPPORTS OF RECTUM
PUBO- RECTAL SLING OF LEVATOR ANI.
REFLECTION OF PELVIC FASCIA
FASCIAL SHEET OF WALDEYER AND A PART OF
LATERAL LIGAMENTS OF RECTUM.
ISCHIO- RECTAL PAD OF FAT.

34. APPLIED ANATOMY