Ascending Colon

Question 1

Position

Answer 1

1. Begins:
   At ileocaecal junction as caecum upward continuation
2. Ends:
   Right colic flexure anterior to right kidney lower part and just below liver right lobe

Question 2

Length

Answer 2

8 inches (12-20 cm)

Question 3

Peritoneal covering

Answer 3

1. Covered by peritoneum anterior and on sides
2. 2 paracolic gutters (longitudinal grooves) are found along its lateral and medial sides

Question 4

Right lateral gutter

Answer 4

1. Lateral to ascending colon
2. Communicates with right anterior and posterior subphrenic spaces above and with pelvic cavity below
3. Only gutter which is open above

Question 5

Right medial gutter

Answer 5

1. Medial to ascending colon
2. Closed above and below
3. Lies between mesentery root, ascending colon and transverse mesocolon

Question 6

N.B.

Answer 6

1. Paracolic gutters may transmit pus between peritoneal cavity different parts in peritonitis
2. Fluid collection in abdomen upper part can pass downwards along these gutters as in perforated peptic ulcer

Question 7

Relations: anterior

Answer 7

1. Anterior abdominal wall
2. Greater omentum
3. Small intestine

Question 8

Relations: medial

Answer 8

Small intestine coils (mainly ileum)

Question 9

Relations: posterior

Answer 9

1. Right iliac crest
2. Right Iliacus
3. Right quadratus lumborum
4. Right transversus abdominis
5. Right kidney lower part
   1-4 are separated from ascending colon by 3 nerves:
6. Iliohypogastric
7. Ilioinguinal
8. Lateral cutaneous nerve of thigh

Question 10

Arterial supply

Answer 10

1. Ileocolic artery
2. Right colic artery
   Branches of superior mesenteric artery

Question 11

Venous drainage

Answer 11

1. Ileocolic vein
2. Right colic vein
   Into superior mesenteric vein (portal circulation)