Colon Supply

Question 1

Arterial supply

Answer 1

Branches of superior and inferior mesenteric artery

Question 2

Branches of superior mesenteric artery

Answer 2

To colon part derived from midgut
1. Ileocolic
2. Right colic
3. Middle colic

Question 3

Branches of inferior mesenteric artery

Answer 3

To colon part derived from hindgut
1. Superior left colic artery
2. Inferior left colic (sigmoid)

Question 4

Marginal artery of Drummond

Answer 4

1. Connects all mentioned arteries as it lies in colon concavity forming important collateral channel between superior and inferior mesenteric arteries
2. It gives straight branches (vasa recta) passing directly to colon
3. It has great surgical importance as it can maintain viability of colon long segment after division of a major colic branch, this allows colon bypass to be feasible

Question 5

Lymphatic drainage

Answer 5

Lymph vessels from colon follow arterial supply to drain into:
1. Epipcoloc nodes on bowel wall
2. Paracolic nodes between marginal artery and bowel
3. Intermediate nodes along colic arteries
4. Central nodes alongside superior and inferior mesenteric vessels

Question 6

Nerve supply

Answer 6

1. Parasympathetic
2. Sympathetic

Question 7

Parasympathetic

Answer 7

Vagus nerve:
1. Caecum
2. Ascending colon
3. Transverse colon right 2/3
Nervi erigente (pelvic splanchnic nerve)
1. Originate from S2,3, and 4
2. Motor to bowel wall and inhibitory to sphincters
3. Supplies distal colon and rectum

Question 8

Sympathetic

Answer 8

Distributes to large intestine blood vessels via greater and lesser splanchnic nerves