Large Intestine: Ascending & Descending Colon

Question 1

Beginning of Ascending Colon

Answer 1

as caecum, at IleoCaecal Junction

Question 2

Ending of Ascending Colon

Answer 2

As hepatic/right colic flexure just below right lobe of liver and anterior to right kidney

Question 3

Length of Ascending colon

Answer 3

8 inches long (12-20cm)

Question 4

Anterior relation of both Ascending and descending colon

Answer 4

1. Anterior abdominal wall
2. Greater Omentum
3. small intestine

Caecum, ascending & descending colon have the same anterior relation

Question 5

Posterior relations of Ascending and Descending Colon

Answer 5

right side is applied is applied to ascending colon, and left side is applied to descending colon:
Bones:
* Iliac Crest

Muscles:
* Iliacus
* Quadratus Lumborum
* Transversus Abdominus
* (left psoas major and left psoas minor posterior to descending colon)

Nerves:
* Ilio-hypogastric N
* Ilio-inguinal N
* Lateral cutaneous N of thigh
* (descending= left Femoral N, Left Genitofemoral N, Left subcostal N)

Vessels:
* External Iliac Vessels
* Gonadal Vessels
* (descending= left subcostal A)

Kindey

Question 6

Medial Relation of Ascending colon

Answer 6

Coils of small intestines (mainly ileum)

Question 7

Arterial Supply of Ascending Colon

Answer 7

IleoColic & Right colic Artery <—- Superior mesenteric

Question 8

Venous drainage of Ascending colon

Answer 8

IleoColic & right Colic Veins —> Superior mesenteric V (portal)

Question 9

Beginning of Descending colon

Answer 9

from left colic flexure

Question 10

ending of Descending Colon

Answer 10

at pelvic brim as pelvic (sigmoid) colon

Question 11

Site of Descending colon

Answer 11

• left hypochondrium region
• left lumbar region
• Left left iliac fossa

Question 12

length of Descending colon

Answer 12

9-12 inches

Question 13

Arterial supply of Descending colon

Answer 13

Superior and inferior Left Colic Arteries (from inferior mesenteric A)

Question 14

Venous Drainage of Descending Colon

Answer 14

Superior and Inferior left colic veins which drain into Inferior mesenteric V. (portal)

Question 15

Site of Right colic (hepatic) flexure

Answer 15

Right Hypochondrium below right lobe of liver

Question 16

Explain why Hepatic flexure lies at a lower level than Splenic flexure

Answer 16

due to liver pushing the flexure downwards

Question 17

Above, anterior and lateral relations of Hepatic flexure

Answer 17

Right lobe of liver

Question 18

Posterior relations of Hepatic flexure

Answer 18

right Kidney (lower part)

Question 19

Medial Relations of Hepatic flexure

Answer 19

• 2nd part Duodenum
• coils of small intestines

Question 20

Hepatic flexure Arterial Supply

Answer 20

Ascending Branch of Right Colic Artery (of sup. mesenteric A)

Question 21

Hepatic flexure Venous drainage

Answer 21

Right colic V —> superior Mesenteric V (portal)

Question 22

Site of Left Colic (splenic) Flexure

Answer 22

Left Hypochondrium, at the anterior/ lateral border of spleen, at a higher level than Right colic (hepatic) flexure

Question 23

Attachement of Splenic flexure to diaphragm is called

Answer 23

Phrenico-Colic Ligament

Question 24

Superior Relations of Splenic Flexure

Answer 24

• Tail of Pancreas
• Spleen

Question 25

Posterior Relations of Splenic Flexure

Answer 25

Diaphragm

Question 26

Medial Relations of Splenic Flexure

Answer 26

• Left kidney
• Coils of Small intestines

Question 27

Arterial supply of Splenic Flexure

Answer 27

Ascending branch of Superior Left Colic A of sup. mesenteric A

Question 28

Venous drainage of Splenic flexure

Answer 28

Sup. left Colic Vein —> superior mesenteric V (portal)