Rectum and anal canal

Question 1

Begins at

Answer 1

termination of pelvic mesocolon (S3)

Question 2

Ends at

Answer 2

anorectal junction- puborectalis m

Question 3

Peritoneal relations

Answer 3

Upper 1/3 - sides and front
Middle 1/3 -front
Lower 1/3 -none
Posterior- fascia of Waldeyer

Question 4

Blood supply

Answer 4

Superior rectal- from abdominal aorta