Chapter 47: Colon and Rectum- Anatomy

Question 1

Identify the arterial blood supply to the colon:

Answer 1

Question 2

What are the white lines of Toldt?

Answer 2

Lateral peritoneal reflections of the ascending and descending colon

Question 3

What parts of the GI tract do not have a serosa?

Answer 3

Esophagus, middle and distal rectum

Question 4

What are the major anatomic differences between the colon and the small bowel?

Answer 4

Colon has:

• teniae coli
• haustra
• appendices epiploicae (fat appendages)

whereas the small intestine is smooth

Question 5

What is the blood supply to the rectum:

Proximal?

Answer 5

Superior hemorrhoidal (or superior rectal) from the IMA

Question 6

What is the blood supply to the rectum:

Middle?

Answer 6

Middle hemorrhoidal (or middle rectal) from the hypogastric (internal iliac)

Question 7

What is the blood supply to the rectum:

Distal?

Answer 7

Inferior hemorrhoidal (or inferior rectal) from the pudendal artery (a branch ofthe hypogastric artery)

Question 8

What is the venous drainage of the rectum:

Proximal?

Answer 8

Via the IMV to the splenic vein, then to the portal vein

Question 9

What is the venous drainage of the rectum:

Middle and distal?

Answer 9

Via the iliac vein to the IVC